Sam likes to think himself as smart, even though he lacks a lot of common sense. He sees the world as one big present to himself that's his for the taking. The fact that he is selfish and egocentric shouldn't be too surprising. He has a big ego, and is just as vain as his sister, if not more so. He has a naive knowledge of how the world works, but has more stopping power than his sister. He is overly trusting, believing that all people genuinely want to help him or serve him to the best of their ability because, honestly, who wouldn't? He enjoys having sex, drinking beer, and shopping. He gets annoyed when people mistake him for a girl, though he isn't above pretending to be one in the hopes of being caught in the midst of a lesbian threesome. He likes pulling pranks and is very enthusiastic and energetic. He is also loud, hot-tempered, and gets easily frustrated. He is deathly afraid of heights and really wants a pet.
Sam owns a handgun and has fairly good aim, as well as extremely fast reloading skills. He also has control over his added appendage and can swing off of things using it. He owns a "ghetto motorcycle" which is basically a bicycle with an engine attached to it. It has a second seat for "picking up chicks", but more often than not, his sister is the one sitting in it.
The same as Lili's. Although, like Lili, Sam has remained attractive all his life, he does hold a bit of ambivalence towards her, as she seemed to have benefited from it the most. Although neither know which was born first, Sam has assumed the role of "older" twin, and isn't about to relinquish it soon. He doesn't like being outdone by Lili, and both are highly competitive with the other. At the moment, Sam is fairly satisfied with his life, and couldn't ask for better. He does not know about his sister's secret college savings, nor her desire to study.