Gashadokuro (Japanese Mythology/Folklore)
When people die, their souls become Calaca (Mexican Folklore), skeletal beings that return to the land of the living on the Day of the Dead to celebrate with their still-living loved ones.
Souls that go to the Land of the Remembered appear as Calaca (Book of Life) bearing skeletal anatomies with markings along their bodies that reflect the festive nature of the world.
Skinner's (Marvel) true form.
Baraggan Lousenbairn (Bleach)
Gravelord Nito (Dark Souls) is made out of many skeletons.
Stalfos (The Legend of Zelda)
Stalmaster (The Legend of Zelda)
Funny Bone (Skylanders Trap Team)
Bone Chompy (Skylanders Trap Team)