|Introduced In||Adventure Time BuritoMan: The Origin|
|Voiced by||Janstif Narciso|
King Demonicon is an evil legendary villain who was defeated by Fabian and Inngrid. He is alike of The Lich, as they both know each other, and looks the same. Later on, Lich explains that he knows King Demonicon, but forgot his name. Elf Prince also knows about King Demonicon. He was later killed by Finn and Fionna by using the "Mighty Hunson".
His looks ressembles as The Lich. He has horns, a dark blue robe, a skull mask, & as being a demon, he has red skin, together with red eyes.