Marceline first appeared in the episode "EVICTED!".She is a vampire(duh).She is also called the vampire queen.Her dad is Hudson Abadeer as shown in "Return to the Nightosphere".Marceline used to have a boyfriend named Ash (in the episode"memory of a memory").In the episode Henchman she made Finn her henchman.she sang several songs namely "The Fry Song" and "I`m just your Problem".She can change into a bat and several kinds of monsters.