Voldemort

Voldemort is the antagonist of Harry Pothead and a recurring character in the series. He wants to kill Harry, although the exact reason why he wants to do this is never explained.

He can use his evil superpowers to cheat death. He uses these powers when he's "killed" by Harry in Harry Pothead, and when he becomes allies with Gandhi in Harry Pothead and the Nuclear Wizard and get attacked by a tracking missile.

Personality
Voldemort is a conundrum. Despite considering himself evil, he is completely harmless, and has only ever threatened to kill Harry. The most evil thing he has ever done is cheat death.

He shows clear intent for murder in S1E4 of Harry Pothead Chronicles, but still wastes his time on talking to Gandhi instead of going to The City.

Trivia

 * Voldemort is only referred to as "The One Whom We Shall Not Name" by Ruby Haggerd.
 * He wears a gay pride shirt at all times.
 * Harry is unaware that he's still alive.