Rosalina is a character from the Mario video game series. She is the third major female character after Princess Peach and Princess Daisy. In the Mario games, she watches over the Comet Observatory. The Comet Observatory is an area in space that orbits the Mushroom Kingdom every 100 years.
Rosalina first appears in Super Mario Galaxy. There, she acts as an ally to Mario. After Bowser attacks the Comet Observatory, she gives Mario the task of getting back the observatory's Power and Grand Stars. She also gives Mario a creature named Luma to help him in his adventure.
In the sequel, Super Mario Galaxy 2, a figure like her named the "Cosmic Guide" appears in the game when Mario dies multiple times in a level. Rosalina herself appears during the credits.
Rosalina makes her first playable appearance in Mario Kart Wii. She is an unlockable character. Rosalina later appears in Mario Kart 7. There, she is again an unlockable character. She also has her own track called Rosalina's Ice World.
Rosalina appears in Super Mario 3D World, where is she an unlockable character. She can use the spin attack move that Mario can use in Super Mario Galaxy.
Rosalina will appear as a playable character in Super Smash Bros. for Nintendo 3DS and Wii U. She will fight with a Luma.