The Reaper first appeared in the episode "Wizard," where he tricks Finn and Jake into taking "free" magical powers. Finn haggled him into giving him his arm as a key chain too. At the end of the episode, he came back and finally offered Finn and Jake a demon's heart, which the two gladly accepted. He made another appearance in "Dungeon."
Appearance[]
He is a skeleton that wears a purple cloak.