theoretical physicist. geeky and cocky. His intellect and obsession with logical reasoning make extremely socially awkward, often seeming almost computer-like when faced with interpreting human subtleties. He also believes that he is always in the right. Initially Sheldon displays an intense superiority complex, and is immediately turned off to anyone he does not value on an intellectual level. But he realizes this is a choice – as he puts it, "I'm not crazy; my mother had me tested."