He first appears in "It Came from the Nightosphere" where it is revealed that he has a shaky parent-to-teen relationship with his daughter. However, Hunson manages to reaffirm his love for Marceline just before being sent back into the Nightosphere. In "Memory of a Memory," Finn sees a flashback of him eating his daughter's French fries, an incident that caused a rift in their relationship and led to Marceline writing her "Fry Song." He reappears in "Daddy's Little Monster," trying to trick Marceline into taking over the Nightosphere. He appears again in "Marcy & Hunson," where Peppermint Butler summons him to Ooo to power up a new Night Sword for Finn, and he stays for a day to visit Marceline.
He is an embodiment of chaos and claims to be "completely evil" (these are later suggested to be effects of the Nightosphere amulet). He also shows appreciation for things he deems to be greatly evil; in "It Came from the Nightosphere", he comments that Gunter is the "most evil thing [he] has encountered" (foreshadowing Gunter's reveal as Orgalorg). Gunter, the Ice King, Jake and Finn were the only souls that were spared during his rampage through Ooo.
In addition, Hunson Abadeer is shown to be rational, cold and calculating. However, he is not totally emotionless, as he appears to be deeply moved by hearing his daughter's song. He confirmed that he loves Marceline, and that he was deeply sorry he ate her fries, never meaning to hurt her. This incident seems to have altered his personality, as in "Return to the Nightosphere", he is far less evil than before even with the Nightosphere amulet on, with the implication that this change was because of his previous interaction with Marceline. While he is markedly 'nicer' than before, he may only be so to Marceline, Finn and Jake. In "Daddy's Little Monster," he was quick to act hostile toward Jake before realising it was him.
He seems to have a twisted sense of humor. He threatens the lives of the Marauders by telling a joke and calls himself their "Mama." He also sings a song about "sucking up souls and stompin' on ants".
He is first shown exiting the Nightosphere as a mass of tentacles, eyeballs, intestines, and various other like appendages, but his usual form consists of a demon-like humanoid with a light blue skin tone, pointy ears, flat dark blue hair, a dark business suit and light yellow eyes with slit neon pink pupils. His face shows slightly more detail than most characters of the show; showing more cheek bone and eye definition than others. The inside of his mouth (aside from his purplish pink tongue) is green, with the hue of green getting slightly darker the closer to the back of the throat. He seems to lack a uvula and a defined chin. His movements are occasionally jerky and unnatural, moving with what appears to be additional or especially stiff but flexible joints. 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 at the back of his throat (an effect of the Nightosphere amulet). When he transforms into a large monster this monstrous head emerges from his throat and replaces his normal head. He wears a pair of red boots just like Marceline. However, without the Nightosphere Amulet, he sports a white tank-top, a pair of green-striped pink boxers, and has a slightly bulging belly that is hidden when he is wearing his suit.
Marceline described Hunson Abadeer as "deathless," apparently meaning that he is immortal even going as far to say he literally can't die. He is capable of stealing souls (with the Nightosphere amulet on), shapeshifting, regenerating, and growing to tremendous sizes. He is very strong and flexible so his body can bend many ways making him extremely adept in conflict. 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.
In the episode "Daddy's Little Monster," it is revealed that some of Hunson's powers originate from his Nightosphere amulet, which endows its wearer with supernatural powers and also apparently fills them with chaotic evil. The latter seems to happen to Marceline, although she was not prepared for the effects of the amulet, whereas Finn had an idea of what to expect and thus was able to resist its dangerous effects upon wearing it.
Hunson is Marceline's biological father. They have had a consistently strained relationship since Marceline's childhood, culminating in him eating her fries when she was a pre-teen, whereafter Marceline felt that he didn't care about her. Hunson would eventually be imprisoned in the Nightosphere and Marceline wouldn't talk to him until the events of "It Came from the Nightosphere", which occurred presumably many hundreds of years after the incident with the fries.
Their relationship begins to heal when Finn plays Marceline's heartfelt Fry Song out loud. Hunson and his daughter have a tender moment where they affirm their love for each other before Finn traps him back in the Nightosphere.
Hunson wishes for Marceline to take over the Nightosphere from him in "Return to the Nightosphere". He well-meaningly attempts to trick her into the role, but eventually realises his wrongdoing. He admits that he is proud of Marceline as she is. In this episode, Hunson calls Marceline "baby" endearingly. Furthermore, his personality in this appearance is markedly different. He appears to be much more casual and docile. This change is possibly due to his greatly improved relationship with his daughter, suggesting that his previous callousness was influenced by bitterness towards Marceline. Marceline also now visits him in the Nightosphere.
Yet, Hunson is a somewhat neglectful parent. In the full version of Marceline's fry song, there exist the lyrics; "Daddy, why did you leave me, You created me, So don't you wanna see me?". At some point in the past, Hunson was separated from Marceline for a considerable period of time in the aftermath of the Mushroom War, during which she was cared for by Simon Petrikov before he was fully transformed into the Ice King. A young Marceline is seen mouthing the word "Dada" as she cries in the flashback that concludes "I Remember You". How Marceline became separated from her father and mother in the first place is yet to be revealed.
In "Everything Stays", Simon, who has almost transformed into the Ice King permanently and is thus leaving to isolate himself, assures a young Marceline that he has arranged for someone else to take care of her. In "Marcy & Hunson," this person is revealed to be Hunson. In a flashback, it is shown that he had re-entered her life after their long separation by smashing a hole in the young Marceline's hut with the family battle axe. He then announces that he was summoned by "someone with glasses" and that he and Marceline should "go suck some souls together", before destroying an entire wall of the hut. Marceline is shocked and repelled by Hunson's reckless obliviousness to her struggle for survival in the post-Mushroom War world. This flashback sheds light on Marceline's deeply hurt reaction to his act of eating her fries in his debut episode many seasons prior; the pre-teen Marceline was not yet a vampire and needed to eat, whereas the deathless demon Hunson has no need to. Yet, he carelessly ate her fries when she needed any food she could get to stay alive in the post-apocalyptic world. This incident appears to embody Marceline's long-held grievance that Hunson didn't care about her survival.
It is possible that Hunson's thoughtless actions that caused Marceline's upset (as well as his general lack of social awareness and empathy) is due to his status as a powerful, immortal demon who has lived for countless millennia. Marceline is a comparatively new addition to his life, and although he certainly loves her, he may not quite understand what parental responsibility, or simply caring for a living being, actually entails. This could be made especially worse by the absence of Marceline's human mother to aid him.
In the present day, Hunson tries spending some time with Marceline while in Ooo, but only manages to wreck her solo concert that night. However, he aids in stopping an attack by Chicle, and urges Marceline and the others to admit that he's "bad but not all bad".
Finn and Jake
Finn freed Marceline's father from the Nightosphere so that Marceline could have closure with him. He was under the impression that Finn was Marceline's "evil servant", but upon learning that Finn is "super good", quickly attempted to steal Finn's soul. Hunson then took Marceline's guitar and, using it as a battle axe, stole souls throughout the Land of Ooo. When Marceline's father came to his senses, Finn was able to lock him back in the Nightosphere.
Despite this, in "Daddy's Little Monster," he thinks Finn is cool and doesn't want any hard feelings between them. Concerning Finn and Jake, he tells Marceline that "they're all right. And that political rap? Pretty great", to show her his appreciation of her friends.
When he confronts Gunter, Hunson says Gunter was the "most evil thing he had ever encountered." They have an argument and Hunson tries to steal Gunter's soul. However, Gunter slaps him in the face and Marceline's father decides not to steal his soul. Hunson then goes on to shout "Keep your crummy soul!" and they have not interacted since.
Hunson frightens the Ice King in his monstrous form, causing the Ice King to soil himself "by choice" and fly away.
It is currently unknown whether he is aware that Simon Petrikov took care of Marceline after the Mushroom War. It is also unknown whether he is aware of the Ice King's past as Simon.
This may be the case as he chose to spare Ice King by frightening him away instead of sucking his soul, whereas he did not make this distinction for any others except Finn and Jake.
Although they have never interacted on-screen, it seems that Peppermint Butler has had contact with Hunson and may have good relations with him. In the background of "Return to the Nightosphere," there is a picture of Hunson playing golf with Peppermint Butler acting as his caddie. This may explain Peppermint Butler's dark past, as seen in "Death in Bloom."
It is possible that Abadeer and Abraham Lincoln or the similar looking character, King of Mars, once knew each other because there is a picture of them together in Hunson's house.
- Marceline and her father are voiced by Olivia and Martin Olson, who are father and daughter in real life. Martin Olson was a staff writer for Penn and Teller, Rocko's Modern Life, Camp Lazlo, and Phineas and Ferb.
- He wears red boots similar to the ones Marceline wore in "Evicted!".
- He is the boss in the game Sound Castle 2. Once you defeat him, you get a badge.
- In "It Came from the Nightosphere", at the moment when he was sucking out Gunther's soul, you can see a little bit of his "monster form" head at the back of his throat. Also in that same episode, when he tries to suck out Finn's soul when Finn screams, "What are you doing?!" you can see his monster form in the back of his throat reply, "Stealing your soul!" You can also see the head when he yawns in "Daddy's Little Monster".
- According to writer Adam Muto, he is more of a demonic creature than a vampire. It was confirmed that Hunson is a demon, not vampire, by Andy Ristaino.
- His statue in the Nightosphere jail reads "Hunson Abadeer, our great leader, with us for eternity."
- According to Jesse Moynihan, Marceline's dad's name is the name his brother gave their car when they were kids. Jesse was also in a band called Hunson Abadeer, but they only wrote one song. Given that he is (in effect) the Lord of Hell, it's worth noting that "Abbadon" has been used by Christian writers as a name of a destroying angel, and by Jewish sources as a region of Hell.
- In "It Came From The Nightosphere", the eyes of his monster form are green, but in the video shown in "Daddy's Little Monster", the eyes are red.
- In Spain (Latino), his name is "Justo Chupalmas" (Lit: Fair Soulsucker).
- A gender-swapped version of him was mentioned by Marshall Lee in "Bad Little Boy."
- The third-to-last line of the song "Finale: Refusing to Refuse" is "Even if we see Marceline's dad."
- He has the same eyes as the Demon Cat - yellowish green with slit shaped red pupils.
- He is the "author" of The Adventure Time Encyclopædia.
- He professes a strange attraction to Lumpy Space Princess in The Adventure Time Encyclopædia that deeply weirds out commenters Finn, Jake, and Marceline, but this may not be canon to the show.
- Hunson Abadeer said in The Adventure Time Encyclopædia that if he was to choose a best friend, he would choose Starchie because even if he is not evil, he is a grave digger and if Hunson found he made a mistake, he would easily have him destroyed once he finds someone more compatilble.
- In The Adventure Time Encyclopædia, he said that even he doesn't remember his own origins, as he has existed since before time and before everything, when "there were only monsters" like Orgalorg.
- ↑ guard in Return to the Nightosphere: "that's Hunson Abadeer. He runs this place."
- ↑ Amazon.com Adventure Time Encyclopaedia YouTube ABRAMS presents the Adventure Time Encyclopaedia panel with the Lord of Evil and Marceline
- ↑ http://frederatorblogs.com/adventure_time/2010/10/12/nightosphere-odds-ends/
- ↑ http://www.spring.me/MrMuto/q/193107441351685637