Brownbeard is a very large, overweight man who appears to be roughly three times the height and four times the width of a normal human. He possesses a long brown beard, with three distinctly kept braids, as well as a mustache. He wears a large coat, over an open shirt, that seems to only reach to his shoulders. He leaves his chest bare, with something that appears to be a large wrestling belt with his jolly roger on it. His hair appears to come out of the top of his tricorne, and is braided back.

After Whitebeard's death he went off and took control of Foodvalten, one of the New World islands formerly under his protection.

However, not too long after making his claim, Brownbeard ended up encountering the Hawkins Pirates. Basil Hawkins casually angered Brownbeard by asking what his name was. Brownbeard then started ranting proudly about his "over 80 million" bounty and glory. Hawkins proceeded to say that Brownbeard's name sounds ridiculous and then, as Hawkins drew his sword and prepared to fight, he states that "he sees the shadow of death upon him".

He lost his legs after he and his crew were defeated by Basil Hawkins. After the defeat, he and his crew came to Punk Hazard and they were given aritifical legs by Caesar Clown. His legs would then be replaced by aligator legs with Trafalgar Law's Devil Fruit ability, making him an aligator centaur and allowing him to walk again.

(Source: One Piece Wikia)