Marceline is Finn's friend and is so called the vampire queen. She showed up twice in season 1 and through out the series she would be. She is around Finn's age but a little bit older, I think. Finn was her henchman in the episode "Henchman" and Finn and Jake first found out about her and saw her in the episode "Evicted!". When Marceline was just a kid, she seems to have been lost and Ice King helped here.
- Marceline is Finn's friend
- She is the vampire queen
- She appears through out the series