Mirror Finns

Mirror Finns appear in the episode "Gotcha!." A number of them appeared in mirrors after Lumpy Space Princess fell into the Phantom Mirror. According to Princess Bubblegum, strange, evil things happen after you look into them. LSP sees Finn take his shirt and hat off, then walk toward her. As he reaches out towards her, his hand becomes black. LSP is attacked by all of the Mirror Finns, until Jake and the real Finn come in and rescue her.

Appearance
A Mirror Finn looks exactly like Finn whilst in the mirror, but when one steps out of it, it appears as a three dimensional shadow of Finn. They have long straight hair, like Finn was seen with originally.