Lemonjon

Lemonjon first appears in the episode "All Your Fault." He is a giant candy person created by the Earls of Lemongrab that is so large that his various organs exist in separate rooms within Lemon Castle. His head appears within the castle itself as a giant living wall with a Lemongrab-esque face. Lemonjon appears to be the oldest of the Lemongrabs's Lemon Children.

Lemonjon ends up rising to his full size and potential when ordered by the Lemongrabs to lay siege on the Candy Kingdom, hoping to use their candy to make even more of their own "creations" and to feed the rest of their already made lemon creatures. In order to save the kingdom, Finn and Jake try to attack its heart, but instead of killing it, they end up awakening feelings the creature never felt prior to that moment.

He says: "Whoa, hold the phone. What is this powerful new juice coursing thrumpst my core source? The juice aches. Is this the rumored ache of feeling? The feeling of caring unknown to lemons? New thoughts emerge... If I act, the candy people will suffer; if I don't, the lemon people will suffer... The greater good demands but one course only! That I dissolve the bonds uniting me and become component to all!"

Upon completing this, Lemonjon explodes, turning into a pile of lemon candies.