Wario
Japanese block figure by Nintendo
Add the Japanese adj., warui, meaning bad, and the name Mario, and you get 'bad Mario' or Wario. He just showed up one day with no point of origin, though I'd imagine he escaped from some strange 'mirror' universe into the Super Mario World. His brother, Waluigi, escaped many years later and has yet to do anything big other than be the nemesis of Dance Dance Mario Mix. It must be a big insult to Luigi when even your 'mirror' counterpart can't even match up to his brother.
