Rosalina (Rosetta in Japan) is a character that first appeared in Super Mario Galaxy, but also names herself as Rosalina. She lives on the Comet Observatory with her adopted children, the Lumas. She is seen as a type of sorceress, with great power. Her sole duty is to watch over and guard the universe, the Mushroom World and protect her Lumas. Rosalina's back-story is described in her story book, which is found in the Comet Observatory's Library in Super Mario Galaxy. Nine chapters can be unlocked throughout the game, and the final one can be unlocked by completing the game.
Super Mario series
Super Mario Galaxy
While visiting the Mushroom World, the Comet Observatory is attacked by Bowser. While attacking, he steals all of the observatory's Power Stars and Grand Stars. Rosalina appears later to Mario, or Luigi, if you've beaten the game once, after Princess Peach is kidnapped. To help Mario or Luigi on their quest, she gives them a Luma, who is named Young Master Luma. He is a Luma with Princess Peach at the Star Festival. After Mario or Luigi collect enough Power Stars and Grand Stars, Rosalina flies the observatory to the center of the universe, where Mario or Luigi will have the final battle with Bowser.
Super Mario Galaxy 2
Rosalina makes her first appearance in the game in the ending cutscene of Super Mario Galaxy 2. When Lubba then reveals that he has met Rosalina before, that is all that is shared. During the game, Rosalina will send letters to the Luma that is with Mario, but knows that she doesn't sign the letters, so the identity of the writer is unknown.
If the player receives 120 Stars and defeats the final boss again, a cutscene is played. The cutscene shows Rosalina and her Lumas in the Library, revealing that she was telling the story of Super Mario Galaxy 2. Then, she decides to narrate how Mario, or Luigi, if you complete the game once, collect every Green Star to her Lumas. If Mario and Luigi collect every single star in the game, and beat the Grandmaster Galaxy Daredevil Comet run, Rosalina will thank and join them on the Starship Mario. Lubba then congratulates you on bringing "The Lady of the Shooting Stars" aboard the ship.
Players can also use Rosalina to represent their file on the file select screen. However, the Rosalina avatar can only be used on save files in which the player has collected 120 stars, and unlocked the Green Star Prankster Comets. This game also features a cosmic entity that highly resembles Rosalina, known as the Cosmic Spirit. This entity will appear after failing to collect a star on a level several times, and she will be there to help you.
Super Mario 3D World
Rosalina is unlockable as the fifth playable character in Super Mario 3D World. She is unlocked by playing and completing the second level in World Star, Super Galaxy. This has marked the first time Rosalina is playable in a Mario platformer game. After defeating Bowser in World 8, if you return to World 1 and talk to the Sprixies they will build you a rocket to World Star. She will appear in the second level of the world, and after completing it she will become playable in any level. Her special abilities, as a playable character, are the Spin Jump and the Spin Attack, originally from the Super Mario Galaxy series.
Mario Kart series
Mario Kart Wii
Rosalina makes her first playable appearance in Mario Kart Wii as an unlockable character. She can be unlocked by having a save file for Super Mario Galaxy and racing in 50 races, or the player can attain at least a 1 Star Rank for all Mirror Grand Prix Cups. Unlike Princess Peach and Princess Daisy, Rosalina is in the heavyweight class while Peach and Daisy are in the middleweight class. While she races, a yellow Luma will circle around her the whole time, and even make sounds as well. Rosalina will wear her normal dress when riding in karts, but on bikes she wears her biker suit, which is the same as Peach's and Daisy's, but has Rosalina's own color scheme. Her emblem on her kart and bike is the Grand Star. Rosalina is also the staff ghost character for Rainbow Road.
Mario Kart 7Rosalina returns again in the Mario Kart series, this being her second time in the series overall. This time, Rosalina doesn't have a Luma circling her kart, but her emblem remains the Grand Star. She is again a heavier character, but this time being in the cruiser class. Just like the previous Mario Kart game, she is unlockable by completing the Star Cup on 150cc. Rosalina has a course named after her, which is called Rosalina's Ice World, which has what appears to be the Comet Observatory in the background.
Mario Kart 8
Super Smash Bros. series
Super Smash Bros. for Nintendo 3DS/Wii U
Rosalina is a newcomer in Super Smash Bros. 3DS/Wii U with Luma as her partner. She is the fifth Mario universe representative and the second female representative after Peach. In battle, Luma mimics the actions of Rosalina, allowing the duo to attack from two places at once. Rosalina's Special Moves and standard move set are all based off of Super Mario Galaxy:
Rosalina's Final Smash Power Star involves her summoning a massive Power Star, which gradually expands while shooting out smaller stars, before exploding, racking up massive amounts of damage for opponents caught within it.
Mario Party series
Mario Party 10
Rosalina makes her Mario Party debut in Mario Party 10 as a starting playable character.
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