Hunson Abadeer

Marceline's father (also Marceline's dad as referred to by Finn, and the "Lord of Evil" as seen in design documents though not in the show itself) appears in "It Came from the Nightosphere". He is freed from the Nightosphere by Finn, who believed that Marceline and her father should be together. Marceline's father initially shared a shaky parent-to-teen relationship with Marceline that involved an evil rampage through Ooo, sucking the souls of many creatures such as the Fuzzy Friends, the Marauders, several highly unfortunate ants, most of the penguins in the Ice Kingdom and some Tree People. Marceline's father is ultimately defeated by Finn, who released all of the captured souls and sealed the deathless being back into the Nightosphere. Marceline's father managed to reaffirm his love for Marceline just before leaving. He probably has not been out of the Nightosphere for some time because when he finds out that Marceline turned the family axe into a guitar he asks, "Did you turn it into some kind of a lute?" (A lute is a type of 18th-century guitar.)

Fan guesses proclaim he may have been related to the Business men, as he wears a similar type of suit, though slightly fancier (This can indicate he may have been CEO or boss of a business company).

Personality
He claims to be "completely evil" and is shown to be extremely rational, as well as cold and calculating. He also shows care for things he deems evil; on the animatic, it shows that he is commenting and observing how Gunter is the "...most evil thing he ever saw" and apparently asking for Gunter's minionship before Gunter hits him in the face. Gunter, the Ice King, and Finn were the only souls that were spared during his rampage. However, he is not completely emotionless, as he is apparently moved by hearing his daughter's song. He also confirmed that he loves Marceline, and that he was deeply sorry he ate her fries, never meaning to hurt her.

Appearance
He is first shown exiting the Nightosphere as a mass of tentacles, eyeballs, intestines, and various other like appendages but seems to prefer a big, blue-skinned humanoid with pointed ears, fangs, demonic eyes, and a dark business suit for his form while in Ooo. He has the ability to shapeshift, like his daughter, and has been seen with a second, monstrous head with a vertical mouth that usually hides inside his normal mouth (most likely part of his true form). Though when he transforms into a large monster this monster head emerges and replaces his normal head. He wears a pair of red boots just like Marceline. He doesn't seem to have a bite on his neck, unlike Marceline, but that could be an aesthetic choice.

Abilities
Marceline's father is "deathless," apparently meaning that he is immortal. He is capable of stealing souls, shapeshifting, regenerating, and growing to tremendous sizes. He is very strong and flexible so his body can bend many ways making him extremely good at fighting. An example of this is his ability to swing his leg behind his head, kicking people in the face who try to attack him from behind; he calls it Karate Kick. This means he might know karate.

Marceline
Marceline is his daughter, who was upset at him for stealing her fries, and feels that he doesn't care about her. After coming out of the Nightosphere, he had an argument with her after taking her Axe-Bass away. He claims that he is a better fighter during their battle when she attacked him. He realized Marceline's feelings toward him when he listened to the song about their relationship. Toward the end of the episode, they had a talk which fixed the problems between them, but was interrupted when Finn sent him back to the Nightosphere.

Quotes
See Marceline's father/Quotes

Trivia

 * Marceline and her father are voiced by Olivia Olson and Martin Olson, who are actual father and daughter in real life. Martin Olson is also a writer who was staff writer for Penn and Teller, Rocko's Modern Life, Camp Lazlo, and Phineas and Ferb.
 * Marceline has been confirmed to have once been a normal human before she became a vampire and doesn't show many of her father's abilities. According to writer Adam Muto, Marceline's father is more of a demonic creature than a vampire. It's unknown whether he was once human as well before being transformed into what he is now.
 * He wears the same red boots as Marceline did in "Evicted!".
 * He is the boss in the game Sound Castle 2.
 * When he sucks out the soul of one of the fluffy people you can see his monster head laughing in his mouth.
 * It is shown that he and Marceline used to live together before the fries incident.
 * In "Memory of a Memory" his suit is more purple than in "It Came from the Nightosphere," where it is darker with dark purple lines.
 * It appeared that when Marcelines Father ate Marcelines fries that they were in a slightly torn down diner from the Mushroom War.