Kee-Oth's initial appearance was that of a large, black-skinned demon with large, bright green eyes. After seeing in an old video how Joshua had kept Kee-Oth from sucking his blood by drinking holy water, Finn defeats Kee-Oth by tricking him into sucking a fake Demon Blood Sword that was actually grape juice blessed by a 'priest' (really Shelby in a movie outfit). Kee-Oth then explodes, and Finn and Lady took Jake home, along with Kee-Oth's previous captive, Samantha. Finn and Lady Rainicorn pursue Kee-Oth back to his fractured dimension after learning the way from Joshua's old video tapes (which had partially been taped over by Jake with romantic scenes for Lady).

In ' The Pit,' Kee-Oth holds Jake hostage and soon learns he is Joshua's son though becomes frustrated at the latter's laidback nature. He then grabs Jake, thinking he is Joshua (and unaware that Joshua is dead), and teleports away. Finn breaks the Blood Sword in half and sends Kee-Oth's blood back to him, causing him to grow greatly in size and power. He grabs them both and threatens to kill them unless Finn returns his blood.

The demon returns in ' Play Date' where Ice King and Abracadaniel bring him back by reading an inscription on the Blood Sword. Kee-Oth first appears in the first message left by Joshua for Finn and Jake, where he is defeated with the spell ' Kee Oth Rama Pancake.' He physically appears at the end of ' Dad's Dungeon,' yet again demanding his blood back, but is repelled by Jake with the same spell. Noah Nelson Kee-Oth is the demon who created the Demon Sword with his own blood, which was taken by Jake's father, Joshua.

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