Mad scientist
The mad scientist, also known as the mad doctor or mad professor, is a stock character of a scientist who has unusual or unsettling personality traits, usually in the taboo or hubristic nature of their experiments. As a motif in fiction, the mad scientist may be villainous (evil genius) or antagonistic, benign, or neutral; may be insane, eccentric, or clumsy; and often works with fictional technology or fails to recognise or value common human objections to attempting to play God.