All costumes
Skeleton costume
Hidden costume
How to unlock
Take over 333 total damage in a single adventure.
Unlock tip
The 333 damage has to land within a single adventure, but it does not have to come from enemies. Jumping into the water in Bunnyville hurts you and counts toward the total, so repeated dips in town cover the whole requirement without risking a run.
Skins
Skeleton
Default skin
Black Bone Skeleton
Purchase, price 30
Oink the Wanderer
Purchase, price 100