Marceline Abadeer (full title: Marceline the Vampire Queen) is one of the main characters in Adventure Time and a half-demon/half-human, and vampire who is over 1003 years old. During her first encounter with Finn and Jake, she forces the two out of their tree fort. Despite initially being an adversary to the two, Marceline quickly becomes one of Finn and Jake's closest friends. Her father, Hunson Abadeer, is the demon who rules the Nightosphere.