Bowser Jr. is the eighth and youngest child of Bowser. He acts as the main antagonist of both Super Mario Sunshine and New Super Mario Bros., with his father playing only a minor role in each. In Super Mario Sunshine, he uses a magic paintbrush, invented by Professor E. Gadd, and a special kerchief to transform into a translucent blue doppelgänger of Mario, Shadow Mario. Thus disguised, he vandalizes Isle Delfino with graffiti, tricking the native people into believing that Mario himself is to blame. In New Super Mario Bros., he kidnaps Princess Peach, taking her to a new castle each time he is defeated. He also appears in Super Mario Galaxy, acting as his father’s right hand and challenging Mario at several points of the game to impede him. Bowser Jr. also makes an appearance alongside his siblings the Koopalings in New Super Mario Bros. Wii. He has also appeared in Mario sports games as a playable character ever since Super Mario Sunshine. Bowser Jr. is voiced by Dolores Rogers in most of his appearances; however, in Mario Strikers Charged, Super Mario Galaxy, Mario Kart Wii, Mario Super Sluggers, Mario & Sonic at the Olympic Winter Games, and New Super Mario Bros. Wii, he is voiced by Caety Sagoian.
Bowser Jr. ranked in the sixth slot on GameDaily’s top 10 Nintendo characters that deserve their own games list.