From Nobody from Nightmare

Many villains are depicted as being born into evil, a common example being an heir to an evil empire. The villains below however, started off as a completely normal citizen. They were originally harmless, and likely had no intention of being evil (or were too weak to be an actual threat), but somewhere along the lines they grew in power, and became a nightmare to everyone else in the process.

Put this unusual because unlike Fictional Villains, Real Life villains are surprisingly yet closely common in a course Real Life itself.