Shadow Mario

Shadow Mario an evil doppelganger of Mario. He appears as an evil clone designed to look exactly like Mario, except blue and made out of Graffiti. He uses his Magic Paintbrush to create a Graffiti and Goop that covers up all of Isle Delfino, and blackens up the Shine Spirtes keeping the Island sunny. He was seen causing havoc on Isle Delfino by some of its residents, causing them to believe that Mario was the cause of their troubles. In all of the levels of Super Mario Sunshine, you have to chase him down squirting him with F.L.U.D.D. It is eventually revealed that Shadow Mario is Bowser Jr., Bowser's son, and that the Paintbrush he uses is made by E. Gadd, who also made F.L.U.D.D. and the Poltergust 3000.