|Occupation|| King of Mars (formerly),|
Former President of the United States
|Introduced in||Animated short|
|Latest appearance||"Box Prince" (in a video game)|
|Voiced by||Pendleton Ward|
Abraham Lincoln debuts in the original animated short, where he encourages Finn to believe in himself after warping his brain in the past and to Mars. He is also seen in "Business Time," where he is a character included in a game on BMO.
He is referenced in Issue 3 of the Adventure Time comic. When Finn is telling everyone how to beat The Lich, he says that just like Abraham Lincoln said in the past and on Mars, "you need to believe in yourself."
The first time he ever appeared in the official series is in one of the many pictures in Hunson Abadeer's house. He is a major character in the episode "Sons of Mars," and is the King of Mars. He lost his immortality (and seemingly his life) in the episode in order to save Jake after he was accidentally killed and sent to the 37th Dead World, and he then changes into the statue from the Lincoln Memorial.
Abraham Lincoln is modeled closely after the real-life Abraham Lincoln. He wears a black suit with a black bow tie. Two major differences from his real-life appearance are that, in the show, he floats like Marceline, and he has a yellow light surrounding his head (at least in the animated short). He also doesn't wear his famed stovepipe hat. Unlike most characters, his hands have five fingers. He sits atop a throne that is engraved with the symbol ♂, the astrological symbol of Mars, which has come to also represent "male" in contemporary popular culture. This symbol can also be found in the arena in which Abe Lincoln sits.
Lincoln speaks in a colloquial vernacular of the late 20th Century, much different from his published speeches in the 19th Century. He uses phrases such as "bums me out" and "I remember when you were really cool" and is extremely expressive and emotional, especially during his sentencing of Magic Man. He is not without subtlety, however, such as the private joke he shared with Death.
If you had just learned to care about living things again you could have come back whenever you wanted (oh Magic Man, you sad Magic Man) instead you bummed around Ooo acting like a jerk for 200 years.
—"Sons of Mars"
Magic Man I give you two choices: one is total annihilation. The wand will touch you and your soul will meet with death; the second is to use the power of the wand to convert your body to living stardust where your consciousness will be jettisoned in the infinite cosmos on an endless journey of wonder and discovery!
—"Sons of Mars"
- "Adventure Time"
- "Business Time" (video game)
- "Crystals Have Power" (mentioned)
- "Return to the Nightosphere" (photo)
- "A Glitch is a Glitch"
- "Box Prince" (video game)
- As stated by Rebecca Sugar, Abraham Lincoln is the equivalent of Jesus in Ooo. However, according to Adam Muto, he is more of a "recognizable figure," while adding that it would be "a stretch to call him a religious figure." 
- He has a very detailed face, unlike most Adventure Time characters. But in season 4 he appears to be not as detailed as he is in the animated short.
- It is implied that Abraham Lincoln has bargained for a soul with Death in the past. He uses a penny as barter, similar to how the dead ones were transported through the river Styx to Hades.
- In "Sons of Mars," both Grob Gob Glob Grod and Magic Man refer to the land as Earth since they are Martians. However, Abraham Lincoln, the King of Mars, still refers to it as Ooo.
- As of "Sons of Mars," he is deceased. He is now the Lincoln Memorial statue.
- When Abraham Lincoln sacrifices his immortality to Death in "Sons of Mars," a gunshot can be heard as the screen fades out. This references the actual death of Lincoln by his assassin, John Wilkes Booth.
- In "Business Time," there are two Abraham Lincolns playing football with each other in BMO's game.
- Abraham Lincoln's coat and bowtie have changed color since the animated short.
- In Five More Short Graybles, it was said that no one has had five fingers for centuries, however Abraham Lincoln has five fingers. Although he has immortality since the 19th century.
- Abraham Lincoln appears in "A Glitch is a Glitch" as a random face.
- Abraham Lincoln on Wikipedia