Crocodile is an enormous man, 253 cm (8'3'') tall, with a wide chest, broad shoulders, muscular arms and legs and thick neck. He is 44 years old, and among others future members of the Shichibukai, he witnessed the execution of Gold D. Roger.
Becoming the new Pirate King was his childhood dream, but as time went by, though, he grew in power and experience, and lost sight of the importance of dreams or trust in one another.
Among the Seven Warlords, he's the one with the second lowest bounty (81,000,000 berries), although had his bounty represented his threat level at the time he met Luffy, it would have more than doubled. He is very intelligent and cunning (one of the smartest in the series), which is apparent from his ability to mastermind Baroque Works while at the same time keep the World Government completely in the dark about what he was doing, while making himself a hero of the people.
After the timeskip and the formation of the Cross Guild, his bounty was increased to 1,965,000,000 berries to reflect his current power and threat level, making him one of the most wanted pirates in the world currently.
Crocodile was once care free and optimistic, and it was stated by Crocodile himself that he was not much different from Luffy once, and he also wanted to become the Pirate King and have adventures. As time went by, he grew in power and experience and his once optimistic outlook faded. Crocodile came to let go of his dreams, eventually becoming one of the Shichibukai. He is now shown to be cold, cunning, ruthless, and cynical. After his defeat at the hands of Luffy, he was shown to have grown a bit kinder, being willing to help others. However, he is mostly motivated by his disdain for the Marines.
At some point, either before he became one of the Shichibukai or after, Crocodile learned of a weapon called Pluton, and became very interested in it.
Crocodile secretly started a mysterious group, called Baroque Works. Being careful not to attract too much attention to himself, he gathered some of the best bounty hunters in the world, and gave them code names based on power. His plan the whole time was to capture Arabasta and read the Poneglyph there to find the ancient weapon, Pluton, and gain what he desires, Military Power.
Crocodile, fighting and defeating Luffy twice, nearly killing him each time, finally believed himself to be rid of Luffy. Nico Robin and Crocodile were brought to the Poneglyph Chamber in the Royal Mausoleum Grounds by the king, Cobra, who was forced to lead them there. Crocodile was betrayed by Robin who reads off history she knows, of both Arabasta and other points in the world. Luffy caught up, and finally defeated Sir Crocodile, with a super version of his Gatling Gun, Gomu Gomu no Storm. With that came the end of Baroque Works, and Crocodile.
It is known that he found Nico Robin at the age of 24, and made a deal with her. He would protect her and give her a home, and she would be his partner. In return, Robin will read the Poneglyph and find the location of Pluton. After years of planning, all the Baroque Works agents finally met Sir Crocodile, and were given their final assignments.
Tashigi, going by her own justice as Captain Smoker ordered, arrested Sir Crocodile, who was stripped of all titles and permissions granted by the Marines and the World Government.
He was taken to a prison with the Baroque Works members. Eventually Miss Goldenweek broke him and the other officer agents out but he refused to go (Mr.1 choose to stay with him), and instead stay behind enjoying one of his cigars smiling as he watches his former agents escape. Crocodile, Mr. 1 and the newly imprisoned Mr. 2 and Mr. 3 were taken to Impel Down, the world's greatest prison.
Impel Down Arc
Once in Impel Down, Crocodile was deemed too threatening to be housed in any visible level, instead taken to Level Six, where he was mostly in isolation. However, he was found by Luffy when he came to Level Six in order to free Ace, his brother. Crocodile was instantly recognized by Imperio Ivankov, who had known Crocodile in his youth. Luffy's crew freed him, realizing that he was the only one who could open the locked door by way of his dehydrating touch. Once he and Luff's crew had started a riot, Crocodile went out of his way on his own to Level Four of Impel Down. Once there he knocked out the guards and found Mr. 1, rewarding his loyalty by opening Mr. 1's cell to free him. From there, both Crocodile and Mr. 1 met up with Jinbei the Fisherman, from whom Crocodile got the idea to create a raft powered by Jinbei's swimming. After he and Mr. 1 defeated the entire crew of a Marine Destroyer by themselves, then used it to catch the falling prisoners sent flying by Imperio.
During the Marineford Arc, Crocodile attempted to attack Whitebeard due to a past feud, but was foiled by Jozu and Luffy. He eventually went on to aid the pirates in their efforts, including saving Ace from his execution, clashing with Mihawk, and rescuing Luffy from Akainu.
After the war, he plans to finally travel back to the New World, alongside his henchmen, Mr. 1.
After the Seven Warlords system was abolished, Crocodile contacted Dracule Mihawk to suggest an alliance. Wishing to vacate his home island due to the constant pestering from the marines, Mihawk agreed and they formed the Cross Guild organization, which puts out bounties on marines and hunted them.
He was next seen with Mihawk on Karai Bari Island, displeased that Buggy, their new ally, was mistakenly seen as their leader and was recognized as one of the new Emperors. However, Mihawk noted that it benefited them as it redirects heat away from them with Buggy as a scapegoat, and they could easily dispose of Buggy whenever the need arose. Crocodile then agreed and allowed Buggy to be declared as the leader for now.
Powers & Weapons
As a former Warlord and one of the heads of the Cross Guild, Crocodile is recognized as one of the most dangerous pirates in the ocean currently, with a bounty of 1.965 billion to reflect it. He possesses the Devil Fruit, the Suna Suna no Mi, which allows him to create and control sand on top of turning his body into sand as well. He has honed it to the point of perfection where he can turn into sand reflexively if attacked, create sandstorms and quicksand, make weapons out of sand, as well as dehydrate and effectively mummify any human or object.
In addition, Crocodile is also formidable in hand-to-hand combat. He often fights using the hook on his left hand, notably against Luffy and Mihawk.