Blackbeard is a middle-aged looking man with a massive build, several broken or missing teeth (though sometimes he does have a full set; whether this is an inconsistency error made by Oda, or is part of the story, is unknown), a pronounced crooked nose and a very large and hairy chest and torso. Long, thick, curly black hair falls down the back of his neck, underneath a black bandanna, and a small scruffy black beard (hence his nickname) grows around his jawline. As the series goes along, his beard becomes longer and scruffier. He is one of the few characters in the series that fit best what a stereotypical pirate should look like. He's extremely tall, being exactly twice Luffy's height. At his first appearance in Mock town, Teach wore an open buttoned white shirt with rolled up sleeves, green pants with black line patterns, a yellow sash around his waist and classical swashbuckler boots complete with large bronze buckle.
During his raid of Banaro Island, he has added a large black and gold Captain's jacket over his attire, along with beads on each wrist as bracelets and rings with gemstones on all of the fingers of both his hands (similar to his predecessor, Crocodile ). At the Shichibuki meeting at the Marine headquarters, he added a necklace of beads to his sash and a traditional tricorn hat over his bandanna, as well as switching to a red shirt. He also has three flintlocks and a flask tied up on his sash around his waist.
Blackbeard's personality seems to be a strange mix of courage and cowardice; strategy and in-consequence; intelligence and stupidity. While at times his character looks strong and fearsome, in others he will seem weak and ridiculous.Blackbeard, like others who carry the "Will of D ," has a strong belief in fate and the dreams of men, but unlike the others is the only one who truly seems to take it to heart. He shares several attributes with Luffy including having a voracious appetite (his favorite food is pie), carefree attitude, very competitive, reckless, persevering and huge ambitions following his dream of finding One Piece and become a new Pirate king . Despite that, there is also a great contrast between him and Luffy. Just before his death, Whitebeard noted that Teach wasn't the one they had been waiting for and dismissed Teach as being incapable of continuing Roger's legacy.
He also has an eye for talent and knew Luffy's potential was worth more than the 30,000,000 bounty he thought Luffy had at on their first meeting. Perhaps because of his strong belief in fate, Blackbeard is highly amoral. He believes that there is no inherent "good" nor "evil" in the world. He is also patient and conniving, having spent decades on Whitebeard's ship just to get his hands on the Devil Fruit he wanted, before killing his and leaving the crew.Blackbeard is overconfident, and while powerful, tends to converse and/or taunt his opponents in the middle of battle. He's done this in every battle he's been shown in, and as a result, he always suffers a heavy, painful attack while his guard is down. Such as when he grabbed a hold of Whitebeard and taunted him about not being able to use his powers, and nearly got cleaved in half with Whitebeard's bisento. Despite his overconfidence, Teach does show a sense of caution also when he wanted the ship Akainu was one and he didn't want to fight Shanks or his crew.
He ate the Yami Yami no Mi, a Logia-type Devil Fruit that allows him to absorb anything into a cloud of darkness that forms around around him. It also gives him the unique ability to nullify the powers of any other Devil Fruit user when he comes into contact with them. He also has control over gravity he can suck people closer to him so that he can attack or grab onto them. The major weakness is that since it allows him to absorb anything and everything attacks can't pass through him. He gets hurt and sometimes more then usual. This fruit is one the stronger and unique devil fruits. He stole the power of the Gura Gura no Mi, which allows to generate powerful quakes or shockwaves by punching the air or ground around him. This is one the most destructive Devil Fruit powers. Currently no one knows how he is able to have two devil fruits at the same time.