The Grim Reaper

The Grim Reaper is an undead character who is affiliated with Dum Dum. He was killed by AceDubs in his own home but since he is death itself, he can raise himself from the dead at any time. He is unique and gifted for being the only undead being that can raise himself from the dead any time and can't ever officially die. Nobody knows who he was before he died and became the grim reaper.