Hyudou Issei is a fictional Character and main protagonist in the Anime/Manga Title High School DXD.
He holds one of the legendary Sacred Gear, Boosted Gear, which serves as host to Ddraig also known as the Red Dragon Emperor.
He attends Kuoh Academy (As a 2nd year student) and known to the entire school as a pervert and part of the Perverted Trio. He has a huge obsession to breast.
A member of of the Occult Research Club and designated as Pawn (lowest rank) in Rias Gremory's Peerage. He aspires to become a High Class Demon and a large harem and be known as a Harem King.
He is a normal high school student in height and built. He commonly wore his Academy Uniform (see picture) consisting of:
- · Blazer (Black)
- · Red Under Shirt
- · Pants (Black)
- · White and Blue Sneakers
Though average in appearance, many of the female of the female characters in High School DXD is attracted to him. It is speculated that this is due to the Ddraig influence, as all the Boosted Gear's wielder are popular among women.
Race: Human (Before his resurrection.), Devil (After his resurrection), and Dragon/Devil Hybrid (After the activation of his Sacred Gear.)
Hair Color: Brown (Black in Light Novels)
Eye Color: Light Brown
No notifiable difference in his physical appearance except for the bat-like wings in his back and with the addition of his boosted gear.
His body slightly become toned and muscular
Balance Breaker "Scale Mail"
Issei gains this form by sacrificing his left arm to Ddraig.
The Scale Mail covers the entire body in red armor plates and adorned with green jewels.
Types of Balance Breaker "Scale Mail":
- Imperfect - Achieved when he sacrificed his arm to Ddraig.
- True Red Dragon Emperor Scale Mail - Achieved during Issei's fight with Vali Lucifer. Red aura and red lightning is emanating from the armor.
- Scale Mail Dividing Gear - Achieved by assimilating one of Albion's gem.
Issei is a happy go lucky guy with perverted tendencies, he goes in great lengths and develop skills that other female character in the series classify them as Sexual Harassment.
Do not be fooled by his lecherous tendencies, as he is one of the characters in the series to display strong degrees of loyalty, bravery, and compassion that earns him the love and admiration of his comrades. One example is the time when he fought the immortal Riser Phenex, he sacrificed his right arm to achieve his Balance Breaker "Scale Mail" and fighting an opponent more powerful than him then, to save his beloved Rias.
When he was murdered by Raynare, he developed a fear of admitting his feelings, as he thought it would cause them to turn their backs on him. He acknowledged that this would never happen, but it was still an intense fear. He overcame the fear of rejection later in the series.
Female Character who harbor affection for Issei:
The primary female protagonist of High School DXD. Born as a pure blooded devil from a prestigious and powerful clan, the Gremory. She is also the sister of Sirzechs Lucifer, the current Overlord.
She is the president of Kuoh Academy's Occult Research Club and rank as King in her peerage (Most of its members are part of her peerage.).
A Nun/Sister Issei meet when strolling in town. She is an innocent and caring individual, always thinking of others before herself. She wields the divine sacred gear Twilight Healing which ca heal any injuries. She was excommunicated from the Church when they found out the she can also heal Devils and Fallen Angels.
She serves as Rias Gremory's Bishop after she is resurrected as a Devil.
A third year student of Kuoh Academy, she serves as the vice president of the Occult Research Club and serve as queen in Rias Gremory's peerage.
Together with Rias, they are known as the two great beauties of Kuoh Academy.
A petite 15 year old girl attending Kuoh Academy as a First year student. She exhibit a stoic personality which make her appear as though that she has a robot like personality.
She reserves in Rias Gremory's peerage as Rook and the one who enact the most violent punishment to Issei whenever he is acting perverted.
A young woman who appeared with Irina Shidou tasked by the Church to retrieve the missing Excalibur s. One of the natural Holy Sword user, she is entrusted to use the Holy Sword Durandal.
After the Kokabiel incident and learning that God is dead, she joined Rias Gremory's peerage and given the rank of Knight along with Yuuto Kiba.
A young woman who appeared with Xenovia, tasked by the Church to retrieve the missing Excalibur s. It is revieled that she is Issei's childhood friend, though he confused her for a boy then.
Irina is a devout Christian, even after the Kokabiel incident and learning that God is dead, she still remain with the Church and serves as Arch Angel Michale's peerage with the rank of Ace of Spades.
The youngest of the Phenex siblings. Before the series start, her brother, Riser Phenex, made her part of his all female peerage.
Like her older brother, she has inherited the powers of the Phoenix, and possesses the power of fire, wind, and immortality.
The founder and former leader of the Khaos Brigade. She also holds the title of Dragon God.
Though known as a shape shifter, she choose to adapt the guise of a little girl.
A Valkyrie formerly working for Odin. Now, she works as a Civics teacher in Kuoh Academy and serves as Rias Gremory's second Rook.
Later in the series, she feel in love with Issei.
Power and Abilities
A technique developed by Hyoudou Issei while preparing for the Rating Game against Riser Phenex and his peerage.
Dress Break has the ability to strip women of their clothing by touching the clothes. To use Dress Break, Issei first comes into contact with his target, after which a magic circle appears at the point of contact. Finally, Issei triggers the Dress Break with a snap of his fingers.
A technique developed by Hyoudou Issei while preparing for the Rating Game against Sona Sitri and her peerage.
Bilingual is an area-effect spell that causes women's breasts to speak, revealing their thoughts and plans and allowing Issei and his allies to come up with counters or defenses. This spell is noted to seemingly bypass spells or other defenses against mind reading, as it does not target the mind directly.
One of the 13 Longinus (said to have the power to kill a God when fully mastered) where one of the Heavenly Dragons, Ddraig, the Red Dragon Emperor resides.
- Boost - His Sacred Gear ability is to double his power every 10 seconds without limit
- Gift - The sub-ability of the Boosted Gear to transfer the multiplied power to a being or object, which makes him great in terms of support.
- Dragon Shot - fire a beam of energy by concentrating his magical powers. After his fight with Sirzechs, being inspired by the way he uses his Power of Destruction, Issei starts working on how to redirect his Dragon Shot by moving them in different directions.
Balance Breaker "Scale Mail"
A Dragon Armor which drastically increases the user's power, abilities, speed, and defense. It also allows the user to use the power of the Boosted Gear and Divine Dividing without the 10-second time limit.
The ability to double the wielder's power without the 10 second rule. Though Over Boost multiplier is infinite, it still depends on the wielder's capacity, too much Over Boost will result to power lost.
Issei gained the Vanishing Dragon's skill Divine Dividing at the price of some of the user's life.
Illegal Move Trident
Also known as the Red Dragon Emperor's Three-Pronged Promotion, is a specialized technique used by Issei Hyoudou that changes his Scale Mail armor into three different forms based on the Evil Pieces used.
There are 3 variation of this technique and does not need the authorization of the King to execute.
Illegal Move Trident Forms:
- Welsh Sonic Boost Knight - also known as the Dragon Star Knight, is the Scale Mail's Knight form. In this form, Issei possesses enormous speed (Godspeed as he called it) that far surpasses Sairaorg's speed. A drawback to this form is the reduction of plates in the armor causing Scale Mail's defense to lower.
- Welsh Dragonic Rook - also known as the Rigid Dragon Tank, is Scale Mail's Rook form. In this form, Issei possesses massive power and defense but has a low speed because of the massive, thickened armor. Its finishing move is "Solid Impact".
- Welsh Blaster Bishop - also known as the Dragon Fang Monk, is Scale Mail's Bishop form. In this form, Issei possesses an enormous amount of magical energy, which he applies it to the two cannons at the back of his armor. Its finishing move is "Dragon Blaster", a severely boosted equivalent of his Dragon Shot capable of leveling battlefields and briefly warp space-time. The drawbacks to this is the amount of time it takes to charge the cannons and stamina lost with each shot. However, this can be replenished by Rias' "Breast Beam".
One of the legendary Holy Swords, like any Holy Swords, it has the power against dark aligned beings. What makes Ascalon unique is the ability to harm dragons. Issei could also transfer Ascalon's ability in his Boosted Gear adding surprise to the attack because the enemy could not see the physical sword.
Generic Devil Powers
His power that came from being turned into a devil.
- Super Human Strength and Endurance
- Enhance Senses
- "Language" - ability to talk with any sentient being.
Familiars are supernatural creatures that are in contract with a contractor to do his/her bidding. They assist in different task from relaying messages to assistance in battle.
Issei has two known familiars, this are:
Slime was Issei supposed to be first familiar, the thing that attracted Issei to it is its ability to dissolve clothes by a mere touch. Slime was mercilessly destroyed by the female members of the Occult Research Club because of its perverted ability. Issei was greatly saddened by the loss.
Skíðblaðnir, a living norse flying ship was given to Issei by Surtr Second. Although it is presently only the size of a toy boat, according to Mathers, it will continue to grow and evolve into different forms by using the aura and imagination of its master as its source, potentially even becoming its own dimension. Second also jokes that if Issei is going to become a harem king, he needs a harem palace. With Issei as its master, it might grow into a flying harem palace. He later names it Ryuuteimaru. Issei can use Ryuuteimaru to fly around as he has yet to learn how to fly using his Devil wings.
Weaknesses and Vulnerabilities
Weakness as a Devil:
Holy-Based Attacks and Items
- Holy Water
- Light Spheres by Angel and Fallen Angel alike.
Weakness as a Dragon:
Dragon-Slaying Spells and Weapons
- Dragon Slayer swords like Gram and Ascalon.
- Samael (Dragon Eater) Attacks/Curses, which is known as the ultimate Dragon Slayer.
Issei can protect himself from Holy Based attack by invoking his Balance Breaker "Scale Mail", Holy Based Attacks has no added effect to Dragons. Dragon slaying attack is a different matter, for his flesh is already merged with Ddraig making him more susceptible.
The Red Dragon Emperor's Awakening
Issei was introduced in the story, where he is asked by Yuuma Amano to go on a date with her. However, at the end of the date, Yuuma suddenly kills him, after revealing herself as a Fallen Angel in the process. In his dying moments, Rias Gremory arrives and saves his life. The next day, after noticing some strange changes within his body, he is attacked by the Fallen Angel Dohnaseek, who critically wounds him until Rias arrives and saves him once more. He is then introduced to the other members of the Occult Research Club, namely Tuuto Kiba, Koneko Toujou, and Akeno Himejima.
He soon learns that all of them, including Rias, are Devils. He also learns to his surprise that he a Devil as well. However, after learning from Rias that he can one day have his own servants, Issei then declares his dream to have his own harem, becoming a "Harem King".
Later on, he meets Asia Argento, a Sister/Nun, and quickly befriends her. He learned that she too possess a Sacred Gear after using it to heal a young boy. He then guides her back to the Church, where, upon reaching near it, he gets strange chills coming from his body, forcing him to stop while Asia goes on ahead.
His first official battle is with the Stray Devil Viser, during this event, Rias told him about Kiba, Koneko, and Akeno's respective traits as Knights, Rooks, and Queens, and later learns, to his disappointment, that he is a Pawn. The next night, Issei goes on another run to meet up with a client, only for the client to be killed by Freed Sellzen, a stray exorcist, upon arriving at the client's home. He is nearly overwhelmed by the berserk priest until Asia intervenes, pleading Freed to let Issei go but gets hit by him, angering Issei who fights Freed one more time but is stopped when the rest of the Occult Club intervene to bring Issei back. Fortunately, Issei eventually meets Asia again at a nearby park the next day, and the two spend the entire day together which ends with the sudden appearance of Raynare who takes Asia back after overwhelming Issei despite the latter using his Sacred Gear.
Determined to save Asia from the Fallen Angel, Issei, with Kiba and Koneko's help, manages to reach the church where Raynare is hiding while fighting Freed once more. However, it is too late when Raynare takes Asia's Twilight Healing, killing her. Determined to avenge Asia's death, Issei fights Raynare in a one-on-one duel and defeats her after activating his true Sacred Gear, the Longinus, Boosted Gear. He then allows Rias to kill Raynare after the latter desperately begged Issei to save her, even going as far as saying she loves him, having seen through her ruse. After the battle, he was delighted after Rias revives Asia as one of her Bishops.
After the Rayner event during his daily training with Rias, Issei was shocked to learn from her that Asia will be moving in with him and transferring to Kuoh Academy. Issei later gets a sudden visit from Rias, who asks to take her virginity much to his shock and surprise. Unfortunately, Rias' attempt is foiled with the appearance of Grayfia Lucifuge, Sirzechs' Queen, who scolds Rias for attempting to break off the engagement set by her brother and father. Later on, Issei meets Riser Phenex (A Devil Issei envy for having an all female peerage, all of them are beautiful), a man from the Phenex Clan who, to his shock, is revealed to be Rias' betrothed. Refusing to accept it, he activates his Boosted Gear in an attempt to face Riser one-on-one but is easily defeated by one of his Pawns.
Rias challenge Riser to a Rating Game to break her engagement, Issei and the rest of the Occult Research Club members go to a mountain to train. He later assisted Rias in her first-ever Rating Game against Riser, in which he assisted in defeating half of Riser's Peerage before going off to face Riser. Issei, however, was incapable of doing anything as his body has reached its limit due to the burden of the boosted power that is continuously placed on his body, and was nearly beaten to death by Riser, forcing Rias to resign. Waking up in his room and being informed of Rias' defeat by Grayfia, Issei becomes frustrated and blames himself for his weakness only to be given a paper with a magic circle engraved in it by Grayfia. Arriving in the engagement party hall, Rias' brother and Satan, Sirzechs Lucifer, reveals that he set up this event as an entertainment for Rias' engagement party, which allows Issei to battle Riser one more time in a one-on-one fight with Rias' engagement on the line, and won by negating Riser's regeneration by assimilating Holy Water and Cross in his Boosted Gear.
Birth of the Breast Dragon Emperor
After the failed wedding incident, the Occult Research Club returned to Kuoh Academy, here, Issei was introduced to the Student Council members led by Sona Sitri, whom it was revealed is a High-Class, Pure-blooded Devil and the heiress of the Sitri Clan. He later re-encounters his childhood friend, Irina Shidou, who was under the Church's orders to retrieve the stolen Excalibur swords. He also found out about Yuuto's past and decided to help the latter to overcome his past. To that end, Issei, Koneko, and Genshirou Saji went to find Irina and her partner Xenovia and made a temporary alliance with the Church Duo, where they will help the two of them to retrieve the Excaliburs in return for allowing Yuuto to destroy them. They eventually encounter both Freed Sellzen and Valper Galilei, engaging in a battle with the two of them who manages to escape. Their alliance was then found out by their masters and the three of them are punished for taking this action without their consent. The Occult Research Club was then confronted by Fallen Angel leader, Kokabiel who challenged the Gremory Team to a fight within the grounds of Kuoh Academy. With backup from the Sitri Team who formed a barrier surrounding the school, the Gremory Team engaged Kokabiel, Freed, and Valper. While the Gremory Team and Xenovia were able to defeat the Cerberus sent by Kokabiel and Freed who was wielding the Fused Excalibur, they eventually engaged Kokabiel in a battle and were overwhelmed by the latter who revealed the death of the Biblical God. The Gremory Team, however, were saved by the sudden interference of Vali Lucifer, who came to retrieve Kokabiel and Freed under Azazel's orders.
Rias introduced her other Bishop, Gasper Vladi, to Issei, Asia, and Xenovia. Issei later helps in Gasper's training on how to use his Sacred Gear. Prior to the meeting of the Three Factions, while visiting Akeno at the shrine she used to stay at, he receives St. George's Dragon Slayer sword, Ascalon, from Archangel Michael, and learned of Akeno's identity as a Devil/Fallen Angel Hybrid. He later assisted in fending off the Khaos Brigade members who came to kill the leaders of the Three Factions during the peace negotiations, as he and Rias went to rescue Gasper who was being used by the Khaos Brigade. After successfully rescuing Gasper from the Khaos Brigade, Issei, Rias, and Gasper are surprised at the sudden betrayal of Vali Lucifer who then goes on to fight Issei. Using the bracelet given to him by Azazel, which act as a substitute for the sacrifice needed to use the Scale Mail, he begins his duel with Vali. While initially incapable of doing much against Vali, Issei uses Ascalon to break Vali's shield and manages to transfer Ddraig's power to Vali's Scale Mail, forcing it to temporarily stop its function and land an attack on Vali. Issei, however, was shocked at the recovery rate of Vali's Scale Mail and with few options left, Issei decides to take a risk by implanting Albion's power to the Boosted Gear, which was successful and created the Dividing Gear. Vali, who was interested at the situation, goes on to say that he will halve all of Issei's surroundings, which Azazel adds on that breasts will be halved as well, angering Issei to the point that he is able to overwhelm Vali in his usual Balance Breaker form. The battle, however, was ended abruptly by the sudden intrusion of Bikou who came to retrieve Vali before he could activate his Juggernaut Drive.
Issei goes to the Underworld with Rias and his friends for the Young Devils Gathering. Upon arriving at the Gremory region, Issei, along with Rias and her peerage, is greeted by the servants of the Gremory household before meeting Rias' mother, Venelana Gremory, and nephew, Millicas Gremory. During that time, he was taught how to read and write the Devils' alphabet, proper table manners, dance classes and how to interact with people with high social status. Before the ceremony for the Young Devils Gathering, Issei meets the four other Devils that are chosen for the competition: Sairaorg Bael, Seekvaira Agares, Zephyrdor Glasya-Labolas, and Diodora Astaroth. After the Rating Game between Rias and Sona was determined, he was forced to train with the former Dragon King, Tannin, in one of the mountains of the Gremory region, he obtained great stamina after the training will prove necessary when he attain his Balance Breaker during the fight against Kuroka and Bikou. He gained full-access to his Balance Breaker after poking Rias' breasts. He then assisted Rias in her Rating Game against Sona. While he manages to defeat Saji, he lost due to blood loss which was set up as a plan by the Sitri Group to defeat Issei. Before disappearing however, Issei reveals his new move, Bilingual, which allows him to talk with female breasts and learned of the Sitri Group's strategy, allowing Rias' team to win the match in the end. While the Occult Research Club is leaving the Underworld to head back to the human world, the group was surprised by the sudden appearance of Diodora Astaroth, a Devil whom Asia healed in the past, who came to propose to Asia.
Issei and group accompany Rias to the television station of the Underworld for an interview, this is for the Young Devils Tournament where they met Sairaorg and his Queen, Kuisha Abaddon, who just finished their interview and told the Gremory Team that he wants to face them with pure power only. During Rias and Diodora's scheduled Rating Game, the match was interfered by the sudden appearance of the Khaos Brigade and the revelation of Diodora's alliance with them before kidnapping Asia. The Gremory Team would then go on to defeat Diodora and his peerage and rescue Asia until the sudden appearance of Shalba Beelzebub who sends Asia to the Dimensional Gap. This act caused Issei to activate the Juggernaut Drive of the Boosted Gear due to the negative feelings that appear after the apparent "death" of Asia and made him go berserk. He defeated Shalba but was incapable of stopping himself until Azazel and Sirzechs composed an Oppai Dragon song and used Rias' breasts as a switch to help him release the Juggernaut. Issei then witnessed the appearance of the Great Red, who was swimming in the Dimensional Gap.
The Heroic Oppai Dragon
Issei goes on a date with Akeno, which ends with both of them meeting Odin, Rossweisse, and Baraqiel, Akeno's father and Fallen Angel leader, who served as Odin's bodyguard at that time. The Occult Research Club is then attacked by Loki who came to kill Odin and create Ragnarok. Issei faces off against Loki in a fight but was dominated by the arrival of Fenrir. Issei and his friends are, however, saved by the timely arrival of Vali Lucifer and his team. The two teams eventually decided to work together to fend off Loki and Fenrir, asking the advice of the Dragon King, Midgardsormr, on how to defeat Loki and Fenrir. During the final battle against Loki, Issei wielded a replica version of Mjolnir, a hammer used by Norse God Thor. While initially incapable of fully using the Mjolnir, Issei gains the ability to use it after helping Akeno reveals her true feelings and make amends with her father through the help of the Breast Fairy, adding with the Holy Lightning of Baraqiel and Akeno and allowing them to defeat Loki.
Issei and Rias go into the Underworld where they undergo an engagement ceremony at the Ruins of Connection. Issei, however, does not realize the purpose of the ceremony. Throughout the ceremony, Issei and Rias undergo four trials set up by the "Satan Rangers". In the first trial, Issei and Rias had to dance; in the second trial, Issei and Rias were tested on table manners; and in the third trial, Issei and Rias was tested on the history of the Gremory Clan and general knowledge in the Underworld, all of which they successfully pass before moving to the final trial. In the final trial, Issei was forced to fight Sirzechs/Satan Red and was completely overwhelmed by the latter until Grayfia's advice on using Rias' breasts as a power-up allowed Issei to use one final Dragon Shot but still lost after Sirzechs negated the attack and retreated while Issei loses consciousness. After the ceremony, Ajuka Beelzebub, one of the Four Satans and the original creator of the Evil Pieces system, remodels Issei's Piece to adapt to the powers of Ddraig.
Issei and the rest of the second-year students goes on a school trip to Kyoto. While on the train, Issei enters the depths of the Boosted Gear, there he meets one of the past wielder of the Boosted Gear and provides him with a box that unlocks his potential and the possibilities when using the Boosted Gear. During the trip, Issei was attacked by several monsters led by Kunou, who thought that he is the one responsible for kidnapping of her mother Yasaka, the leader of the monsters. While they manage to clear off the misunderstanding, Issei and his friends are soon confronted by the group who captured Yasaka, the Hero Faction led by Cao Cao. While the first fight was cut short by the interference of Le Fay Pendragon and Gogmagog from the Vali's Team, Issei and his friends are forced to face off with the Hero Faction one more time to rescue Yasaka.
During the fight, after seeing his friends being defeated one after another, Issei curses his own lack of power, with Belzard and Elsha's advice, Issei successfully achieved the Illegal Move Trident due to his desire to protect his friends and again, Rias' breasts, allowing him to change the Scale Mail armor through Promotion. With his newfound power, Issei manages to temporarily overwhelm the entire Hero Faction before succumbing to the exhaustion caused by Illegal Move Trident. The team, however, was rescued by the sudden appearance of Sun Wukong who fends off the Hero Faction and using his Senjutsu to rejuvenate Issei, allowing him to use one more attack which he landed on Cao Cao's eye. After coming back from Kyoto, the team was scolded by Rias for not calling her to help them before Azazel tells the group that Ravel is transferring to the Kuoh Academy, much to the dismay of the Occult Research Club girls.
After finishing another campaign, Issei and Rias met Venelana, Rias' mother, who complimented them for their hard work before scolding Rias for her lack of progress with Issei. Rias would then attempt to seduce Issei by trying to have sex with him in the sauna room of the Hyoudou Residence. Issei, however, fails to understand and calls Rias "President", greatly saddening and angering the girl, asking him what is she to him. He later reveals to Koneko, Asia, and Akeno (who are trying to "heal" him) that his experience with Raynare made him fear women after he planned his whole first date with her, only to be killed and treated terribly by her, made him afraid to call girls by their first name, and also made him afraid of being disliked by other girls or rejected if he showed his feelings again. The girls, however, quickly object to this, and Raynare's "curse" is lifted from Issei's heart.
During the Rating Game against Sairaorg Bael, Issei fought against Sairaorg's Bishop, Coriana Andrealphus, and Queen, Kuisha Abaddon, both of whom he defeats before facing off against Sairaorg and his Pawn, Regulus, in the final match with Rias. During the match, Issei was doing well against Sairaorg until Sairaorg fused with Regulus to use his Balance Breaker, overwhelming Issei. Issei was able to overturn the situation by gaining access to the True Queen, achieving Cardinal Crimson Promotion which combines the power of Rook, Knight and Bishop to his Balance Breaker armor and changing it to crimson. Using his newly acquired powers, Issei manages to fight on par with Sairaorg, successfully defeating the man in a fist fight. They won after Sairaorg lost consciousness. Following his victory, Issei cannot hold back his feelings for Rias and confesses to her, calling her by her first name for the first time. She accepts his feelings in tears of joy and the two officially become a couple, although it seems none of the other girls (Akeno, Xenovia, Asia, Koneko, Irina, and Ravel) have given up their love for Issei.
Issei like the rest of the Gremory Team are surprised to see Ophis in Issei's house. She was accompanied by Le Fay and Kuroka, which was set up by Azazel after Ophis claims that she wants to observe Issei. Later, Issei, Akeno and Yuuto goes to the Glasya-Labolas territory to take the promotion test to become Middle-Class Devils. After the test while the group is resting, they were ambushed by Cao Cao and Georg who came to steal Ophis' powers. The battle ended with the Gremory and Vali Teams losing to Cao Cao and Ophis' powers was stolen. Both teams were then attacked by a legion of Grim Reapers and Siegfried. They eventually overcame the situation by having Issei use Rias' breasts to replenish Issei's magic and successfully force their enemy to retreat until Shalba appeared with a kidnapped Leonardo, forcefully activating Leonardo's Balance Breaker which creates 13 gigantic monsters to destroy the Underworld and kidnapped Ophis.
Before the volume ends, Issei went to rescue the Ophis from her captor Shalba who escaped into a crumbling dimension field. Issei caught up eventually, he fought Shalba and manage to win. But during the fight, Shalba manages to strike Issei with an arrow infused with Samael's blood, which led to Issei's death.
Issei's original body is destroyed because of Samael's curse. With the help of Great Red and Ophis, sucessfully gained another body and sucessfully saves the child who was taken hostage by Jeanne and Heracles, defeating the former easily. He has his third encounter with Cao Cao but was easily outmatched by the latter, even with Rias using her ability to recharge Issei's power, until Issei used a bullet from Gogmagog that has Samael's blood on it on Medusa's eye that Cao Cao was using, reversing the situation. In order to turn back the tide of battle, Cao Cao attempts to activate the Truth Idea, but it does not work because Truth Idea's effects depend on God's will in the Holy Spear and it will be different depending on what the will chooses. The True Longinus has chosen the wish in Issei's heart rather than Cao Cao's ambition, thus Cao Cao is defeated. At the end of Volume 12, Issei is officially promoted into a Middle-Class Devil along with Akeno and Yuuto. Afterwards, Rias and Issei plan on going out on a date as promised earlier, with the rest of the Occult Research Club members (including the guys, much to Issei's distress) deciding to go on dates with Issei as well.
In the Extra Life of Volume 13, Millicas goes to the Hyoudou Residence and temporarily stays with them. He later has a mock battle against Issei, Kiba, and Gasper. Despite losing to them, Issei notes that his power is extraordinary and his talent is said to be the same as that of Vali. Later, when Sirzechs asked him whether he liked Satan Red or Oppai Dragon, Millicas chose the latter. This made Sirzechs sad, and it became worse when he saw Issei and Millicas getting along. At the end, Issei calls him Millicas instead of Millicas-sama. Issei is later given a familiar, the living Norse flying ship Skíðblaðnir, by Surtr Second.
The Legend of Oppai Dragon and his Lively Companions
Issei meets the Director of the Magician Council, Mephisto Pheles, regarding the pact between the Occult Research Club and Magicians. He later attended the negotiation with the Vampires who were led by Elmenhilde Galnstein who wanted Gasper to join her clan, the Carmilla Faction. He was completely ignored when he asked her a question due to his status as a servant. Several days later, while attending his class, Issei was attacked by three Stray Magicians who distracted him so that they could kidnap the first-year students of the Occult Research Club. He, along with the other members of the Occult Research Club and the Student Council then go to battle them and easily disposed of the Stray Magicians and the Magicians from Khaos Brigade before a voice called Issei, Akeno, Xenovia, Asia, Irina, Rossweisse, Saji, and Sona to meet him. The group was sent into a "factory" built in the Dimensional Gap that was used to create artificial Phoenix Tears using clones of the Phenex Clan. After some talk with the supposed leader, he summons Grendel and Issei was forced to battle him one-on-one, but was overpowered throughout the fight until he used Ascalon's Dragon Slayer abilities to turn things around. It was then that the leader of the Magicians, Euclid Lucifuge, calls Grendel to retreat while revealing himself to Issei and the others.
- Issei's height is 170 cm. (5 feet 7 inches) and his weight is 62 kg. (137 lbs.) - Visual Data Book Status.
- Issei is the only person other than Sirzechs to see Grayfia's naked body.
- Described as having a lecherous face by Ophis in the short Story "MY FIRST ERRAND"
- Issei is a Dragon Ball fan.
- Issei's life is shorten if he use Albion's Divine Dividing ability.
- In the Light Novel, Issei's Dragon arm is depicted as a scaly Dragon arm that covers his entire left arm, while in the anime, his Dragon arm is replaced by the Boosted Gear. As of Season 2, the anime version of Issei's Dragon arm resembles how it is described in the Light Novel.
Issie VS Dohnaseek
Issei suffered an utter defeat on this one, but considering the circumstance that he was just revived as a devil and has no access to his current powers, such is understandable.
Issie VS Viser
No notable contribution to the battle, he is just observing as to how Rias' group operate.
Issei VS Rayner
The tides of battle first favor Rayner, her power set, mainly Sacred Light Sphere deals tremendous amount of damage to Issei when hit. At first Issei was outclassed and outmatched, but because of sheer will and his Twice Critical evolving to its true form, Boosted Gear, he over powers Raynare but left it to Rias to deal the killing blow due to some lingering affection.
Issei VS Riser
Issei battle with Riser is somewhat a testament that Issei is not just an idiot who rush head-on. In-spite of lose of confidence from his previous loss to Riser due to inexperience, he managed to device a plan negate Riser's most prized strength, the Phenex clan's regeneration ability by transferring holy property in his Balance Breaker "Scale Mail".
Issei VS Vali
Vali, quoted to be the most talented and powerful among Albion's host give Issei one hell of a fight, he deliberately angered Issei for him to realize his true power, for the fuel for the Boosted Gear is the wielder's desire. Now, Issei having the overhelming desire to defeat Vali unlocks the true form of Balance Breaker "Scale Mail". Even when the unlocked Balance Breaker, Issei still has trouble going head to head with Vali. Noticing that Issei was not yet using his full potential, Azazel told Issei that Vali was using his Divide Dividing ability to halve every breast in the world, especially Rias. Issei taps his overboost ability and absorbs Ascalon into his Boosted Gear. He manages to overwhelm Vali for a while by destroying his armor which was regenerated in an instant. The fight was interepted by Bikou, telling Vali that they need to retreat.
- "Stupidity is fine! If I can't win with ability, I'll excel through stupidity!" (Volume 4, Life 5)
- "That's because we have to look, if there is an Oppai in front of us!" (Volume 7, Life 2)
- "Lechery is my strength! Lechery is my justice!" (Season 2 New, Episode 3)
High School DXD 3DS "Erotic Battle Adventure Game"
High School DXD Card Game