Cosmic Owl

Cosmic Owl is creature that appeared in Prisoners of Love in Ice King's Imagination Zone when he was knocked out by Finn. When Ice King contemplates why people do not like him, the Cosmic Owl answers, "You're a sociopath." It is unknown if the owl is evil or good.

The Cosmic Owl then makes an appearance in the episode Donny as a drawing.

Trivia

 * The owl's design is based on the lighting above a urinal at Cartoon Network Studios.
 * In the episode "Donny," the Why-wolves reveal this owl to be the "Cosmic Owl," which is destined to someday devour the Why-wolves.

Quotes
"You're a sociopath."