Rosalina is a character in the Mario franchise by Nintendo.

She debuted in Super Mario Galaxy, where she acted as a major 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 in the game and also watcher of the cosmos.

In the game's storyline, the Comet Observatory was 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, Rosalina agrees to help Mario rescue Princess Peach, whom Bowser had kidnapped.