The Lumpy Space Prince is the gender-swapped version of Lumpy Space Princess. He appeared in the season three episode "Fionna and Cake." He was only shown drinking something from a light-blue cup. Because so little of him is seen his similarities with Lumpy Space Princess are currently unknown. He did not speak.
Lumpy Space Prince is identical to Lumpy Space Princess except with a mustache and a darker shade of purple skin.
- LSP and Prince Gumball, Flame Prince, Muscle Prince, and Turtle Prince are currently the only princes shown in the series.