Butterfly With Laser Gun

The Butterfly with a Laser Gun appears in "The Other Tarts". He robs Finn and Jake of the last two royal tarts as they're traveling through the Desert of Doom. After he shoots at them with his laser gun, he flies away with the tart container, saying he has to "book it to nana's for brunch." He is last seen falling through the air, paralyzed after having taken a single bite of a poisoned tart.

Trivia

 * The Butterfly sounds strangely like the Witch.