Boneheads

Boneheads was a large, vicious skelleton like creature that made its first apperence in WarioWare, Inc.: Mega Microgame$!.

The Takeover
Boneheads appers only in Kat and Ana's stage. In it, Boneheads comes in the middle of the night to possess the prince or princess of the castle. Ana appers, along with her crew of six ninjas to stop him from doing this, but all of them fail. Then, before she was captured, she sends a letter (attached to Don the Sparrow) to Kat, calling he for her help.

Kat to the rescue!
When Kat eventually recieved Ana's letter, she along with her pet Paw the Dog, imediately travel to the castle. Upon arriavl Boneheads challenged her to reach the top floor, where Ana and the prince or princess was being held.

The Showdown
When Kat finally reached the top of the castle, she started to attack Boneheads, but she failed to deafet him though. Suddenly, Paw the Dog transformed into a giant sowrd that Kat eventually used to finally deafet Boneheads. He has not made another apperence since.

Triva

 * His appearence is that of a Japanese emperor. This might suggest that his is the ancestor of the prince or princess of the castle.