Death

Death, also known as Mundus, is a villian of both Adventure Time: Knapford Edition and Regular Show. He is rival to Leonard and Finn and loyal commander to Megatron and Soundwave. Death was once beaten by Skips in a arm wrestle to the death, and gave back Rigby's soul. He held both Finn and Marceline captive but he then gets killed by Leonard by getting stabbed in the chest, then he releases all his souls.