|King of Ooo|
|Occupation||King of Ooo|
The King of Ooo (referred to in the Candy Kingdom as Princess of Ooo, and often called KOO) is a criminal and the former ruler of the Candy Kingdom who first appears in "Apple Wedding." He is a controversial figure in the Land of Ooo of debatable power, who travels in a rigid airship, otherwise known as a zeppelin, which he calls his "zep" and apparently maintains a website, "kingofooo.com." He seems to hold a cult-like sway over some inhabitants of Ooo who consider him their proper ruler, though it is unclear if he actually is a king or just a con artist taking advantage of his "subjects." King of Ooo reappears in "Ocarina" on a wanted poster at the Candy Kingdom police station and as a golden statue seen in Kim Kil Whan's house. The former suggests he may be a criminal or he may have possibly been charged with fraud. He appears in person once more in "Gold Stars" tricking Sweet P into helping him rob numerous Candy Kingdom citizens.
In "Hot Diggity Doom," the King has regained his "zep" and his following thanks to help from a mysterious helper who turns out to be Orgalorg. He successfully runs against Princess Bubblegum for control of the Candy Kingdom (even getting Sweet P back on his side), winning in part because she is too preoccupied with the Catalyst Comet to campaign against him, as well as Bubblegum creating the Candy People with low intelligence to eliminate any potential dissent against her rule, rendering them unable to realize the difference between a good leader and a bad one. The kingdom then almost immediately descends into chaos as the Catalyst Comet arrives. The king immediately realizes this and was saddened when he thought that it was his fault. Toronto consoled him and he came to the conclusion that it was Princess Bubblegum's fault. He is the ruler of the Candy Kingdom from the end of "Hot Diggity Doom" to "The Dark Cloud" when the candy people choose to rebel against his leadership, and Crunchy pushes him into a fireplace, taking the throne. The King of Ooo is last seen fleeing through the candy streets as an amorphous blob of earwax.
- In LEGO Dimensions the King of Ooo is pictured on boxes saying "Vote" showing the King of Ooo and Princess Bubblegum's faces. These can be found in the Candy Kingdom.