Edward Weevil is a violent man as he left destruction in his wake when hunting Whitebeard's crew and allies. He is not very bright as he had a hard time telling the difference between a mirror and a photograph. As a result, he is constantly manipulated by his mother, making him believe that he is the rightful heir of the Whitebeard Pirates' fortune, not the members of the Whitebeard Pirates, to whom he believed (influenced by his mother) are unworthy. He also talks in a whiny, snot-nosed manner, making him sound like both a little kid and a simpleton. Though his claims are widely doubted, at the very least, he seems to genuinely believe them to be true.
Unlike his self-proclaimed father, Weevil does not hold concepts of family in the same regard, believing that his alleged blood heritage is what makes him true family, not bonds built on friendship and camaraderie. Because of this, he violently attacked all those once affiliated with Whitebeard.
He also holds grudges, as he wanted to avenge his alleged father's death upon Blackbeard, but was convinced by his mother that revenge is not important.
Weevil proclaimed that he is the son of Edward Newgate, a claim that is heavily questioned by others. He eventually joined the Shichibukai sometime during the timeskip.
During the timeskip, Weevil fought and destroyed 15 pirate crews that served under Whitebeard, in order to claim Whitebeard's treasure that Bakkin promised him. All of these started as small arguments that turned into large conflicts.
Weevil defeated A.O's crew after a small argument like usual. His mother told him that they must find Marco in order to claim the late Whitebeard's fortune, but Weevil was more interested in taking vengeance on Blackbeard for killing his alleged father. After convincing him otherwise, she then read from a newspaper about how the Straw Hat Pirates defeated Doflamingo and he questioned his mother whether or not to chase after Luffy to get information on Marco.