The Plague Assassin

The Plague Assassin was an assassin/hitman that worked for Buffalo Billy and Dum Dum. He only showed up once in the show where he was ordered by Dum Dum to assassinate Black Guy. He then killed Black Guy but instead of Black Guy fully dying, he was teleported to the Eternal Darkness Portal where he was in between life and death. The plague assassin's next victim was AceDubs, and right as he was about to kill AceDubs, Black Guy escaped the eternal darkness portal and jumped out and shot down the plague assassin with a machine gun which killed him.