Humans

Humans are an endangered species in the post-apocalyptic setting of Adventure Time. It is suspected that Finn is the last human on Earth. Many characters have marveled at Finn's humanity, like Princess Bubblegum in the episode "Susan Strong." Ethel Rainicorn even went as far as to say that she believed Humans to be extinct. The scarce Human population in the Land of Ooo can probably be attributed to the Mushroom War, a war that took place somewehere around 1,000 years before the present story line and is thought to have involved the excessive use of nuclear arms. Fionna is the only other known human besides Finn, but it possible that she is not of the same reality or universe as Finn and Jake.

Known Humans

 * Finn
 * Fionna
 * Old Man (Possibly)
 * Susan (Possibly)
 * Actors from various pre-Mushroom War media such as "Heat Signature."
 * Abraham Lincoln

Possible Former Humans

 * Marceline
 * Marceline's Father
 * Marshal Lee
 * Businessmen
 * The Lich
 * Wendy
 * Georgy
 * Booboo