Rosalina, known as Rosetta in Japan (ロゼッタ), is a fictional character in the Mario series of video games. She debuts in Super Mario Galaxy, where she acts as a non-player character who resides in the Comet Observatory, the game's hub world. She is the adoptive mother of the Lumas, a fictional species of star in the game, and also watcher of the cosmos. In the game's storyline, the Comet Observatory gets attacked by Bowser, leaving her stranded in space without a source of power. In return for Mario's help in collecting Power Stars and repowering the Observatory, she agrees to help Mario rescue Princess Peach, whom Bowser had kidnapped. Rosalina has since appeared as a player character in subsequent Mario games, including the Mario Kart series since 2008's Mario Kart Wii, 2013's Super Mario 3D World, 2014's Super Smash Bros. for Wii U, and 2018's Super Mario Party and Super Smash Bros. Ultimate.