Bowser Jr., the son of Bowser, holding his magic paintbrush.

The Magic Paintbrush is an item that first appeared in Super Mario Sunshine for the GameCube. In the game, it revealed that Professor E. Gadd originally made it for Mario, but Bowser Jr, Bowser's son, stole it from him. Once he stole it, he covered the toxic ink that was in the paintbrush across the Isle Delfino.

Super Mario Sunshine

Other Appearances

Super Mario Sluggers

Super Smash Bros. for Nintendo 3DS/Wii U