Bowser Jr. - New Super Mario U Guide - IGN

Bowser Jr. is the kid son of the King Koopa himself, and has helped his villainous father kidnap Princess Peach on more occasions than one. He calls her

New Super Mario Bros. U Deluxe - Super Mario Wiki, the Mario encyclopedia

New Super Mario Bros. U - Bowser Jr. - Mario Party Legacy

New Super Luigi U - 7-Airship: Bowser Jr. Showdown

Ludwig von Koopa - New Super Mario U Guide - IGN

New Super Mario Bros. U - Wikipedia

Morton Koopa - New Super Mario U Guide - IGN

Meringue Clouds Airship Bowser Jr. Showdown - New Super Luigi U Guide - IGN

World 8-Bowser's Castle - New Super Mario Wii Guide - IGN

New Super Mario Bros. U 3 Star Coin Walkthrough - Meringue Clouds-6: Snaking above Mist Valley

Mario - Wikipedia

Peach's Castle-Castle The Final Battle - New Super Mario U Guide - IGN

Bowser Jr. Part Two - New Super Mario U Guide - IGN

Evolution of Bowser Jr in Super Mario Games (2002-2021)

New Super Mario Bros. U Nabbit Chase Stages Revealed