Lumpy Space King has had two slightly different designs throughout the series. His appearance is that of a purple Lumpy Space Person. He wears black-rimmed glasses, and, like LSP, has a gold star on his forehead, which probably represents royalty in Lumpy Space. This may also be a kind of indicator that his floating powers are active, because when LSP "turned off" her floating, her own star turned dark. He is conjoined with Lumpy Space Queen. The reason for this is that when Lumpy Space People marry, they become fused together. In his original design, he is scruffy and slightly chubby-looking, with long, stringy hair, a green, striped tie, almond-shaped glasses and chin stubble.
- "The Prince Who Wanted Everything" (gender-swapped version)
- "Trouble in Lumpy Space" (debut)
- "The Duke"
- "The Eyes"
- "The Monster"
- "Skyhooks II" (flashback, no lines]]
- "Come Along With Me"
Daughter! Have you brought smooth people into our domain?!
You've made your mother cry for the last time, Daughter! You are hereby banned from using the royal car!