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Official Site: Nintendo

This is a list of fictional characters who appear in the Mario series of video game developed by Nintendo, as well as spin-off media, such as books, comics, and animated series.

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 , 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 and Super Mario Galaxy 2, 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 his early appearances; however, since Super Mario Galaxy, he has been voiced by Caety Sagoian.

Bowser Jr. ranked sixth on GameDaily's list of the top 10 Nintendo characters that deserve their own games list. They also listed him as the 18th best Mario enemy, calling him a "chip off the ol' block" from Bowser.

is an old, female who acts as an adviser and babysitter for Bowser in the Paper Mario games. She possesses the usual Magikoopa powers, and is primarily distinguished by her ability to summon yellow blocks, which she has used to both impede and combat Mario. She first appeared in Paper Mario for the Nintendo 64, helping Bowser by leaving enemies in Mario's way, transporting Bowser into the Star Spirit Sanctuary, and augmenting his size and power in the final battle. After being defeated by the Star Kid, Twink, she continued to work for him.

Princess Daisy has not been a contender in any CBUB matches.