Bowser Jr. is a character that first appeared in the Mario Bros franchise game "Super Mario Sunshine." Bowser Jr. is the only known child of Bowser and should not be confused with Baby Bowser, a villain in the Yoshi series who is actually the infant self of the regular Bowser.
Bowser Jr. has helped capture and kidnap Princess Peach, battling both Mario and Luigi on different games and versions. The only wish of Bowser Jr. is to comply with his father´s evil desires at all times. This character replaces Ludwig Von Koopa as Bowser's second in command in Mario Bros.