Black Bowser

"I have harnessed the power of the black paint! Nothing can stop me now!"

- Black Bowser

Black Bowser is the form Bowser took when he was possessed by black paint in Paper Mario: Color Splash. He acts as the final boss of the game.

History
At Port Prisma on Prism Island, various Toads were enjoying playing with the various colors of paint available. Bowser, who was looking from above, jumped into the rainbow-painted area in the middle of the Big Paint Stars with the intent of giving his shell a rainbow hue. However, his jumping around the paint caused him to inadvertently create black paint, which proceeded to brainwash Bowser (turning him into Black Bowser) into stealing the Big Paint Stars and ordering his minions to drain the island and its inhabitants of their color.

After Mario and Huey retrieved the first Big Paint Star from Morton Koopa Jr. and returned it to Port Prisma, Black Bowser appeared and kidnapped Princess Peach, taking her to his castle on an airship.

Following the collection of the remaining Big Paint Stars, Mario and Huey went to Black Bowser's Castle via a kart ride from Luigi. Here, after overcoming some tribulations (including fighting Roy Koopa), Mario and Huey confronted and eventually defeated Black Bowser, ridding him of the black paint and returning him to his normal self.