Rubber Soul is a medium-height man with curly hair whose Stand lets him grow larger and shapeshift at will. Dio brought him on board with a straightforward deal: a hundred million as payment for taking out Jotaro.
As a person, though, Rubber Soul is pretty disturbing. He's rude, disrespectful, and completely without mercy—he basically views people and animals as nothing but food for his Stand, Yellow Temperance. He's not exactly the sharpest tool in the shed either, but he's got a terrible temper to make up for it. When he tried to ambush Jotaro by impersonating Kakyoin, his weird behavior immediately gave him away.
His violent streak is hard to miss. He'll break a pickpocket's back without hesitation, and he casually ate a dog right in front of its owner using his Stand. He even ate bugs just to bulk up. Fans often note that his complete lack of regard for anything living—human or animal—is one of his defining traits.
Content compiled by AnimeList.moe from publicly available sources.