Karl is a thin, medium-sized, peach-skinned pika or tarsier-like pirate in the Arcade Creator that, so far, only appears in the Cave World. Karl will punch and kick the player if in combat, and also can stop any spell with his shield. Karls, like Squirts, Grumbles, and generic baddies, only take two stomps to defeat. It is also one of the few enemies known so far with a close-combat ability.
- Karl's name is likely to have derived from Carlito syrichta, the scientific name for the Phillipine tarsier species, the animal that Karl would presumely be based off of.