bowser_jr.

The Prince of the Koopas. Bowser Jr. (sometimes written as Bowser Junior) is Bowser's child–and the only one since Shigeru Miyamoto gave official notice of Bowser's paternity of the Koopalings having been retconned "in a 2012 interview.":https://web.archive.org/web/20180504092230/http://www.gameinformer.com:80/b/features/archive/2012/09/24/miyamoto-tezuka-interview.aspx