Rosalina

Rosalina is a character in the Mario series who first appeared in Super Mario Galaxy for the Wii. She is a princess and the protector of the Luma creatures in the game. She can be found in the game's Observatory, or hub, where she needs Mario's help.

In Japan she is known as Rosetta, but her name was changed elsewhere for some reason.

When the game was being developed, the creators were originally going to make Rosalina related to Peach in some way, though for whatever reason decided not to do this.

The developers told the character's backstory through the Comet Observatory's library. Every so often during the game's events you'd be able to go into the library and learn more about the character and her past, and how she got to where she is now.

History
Rosalina was actually born in Mushroom Kingdom and that is where she was raised as a child. But one day she found a shooting star which was a actually a space ship with a Luma inside it. The Luma was looking for her mother. Rosalina decided to help the Luma find her mother. They fixed the space ship and set of on journeys. Rosalina eventually built the Comet Observatory and with Polari they looked after all the lumas.

Mario Kart Wii
Rosalina is also a playable character in Mario Kart Wii. It was her first appearance outside of the primary platform video games, where she appeared alongside two other "damsels in distress" as well - Princess Peach and Princess Daisy. Rosalina is classified as a heavyweight character and appears alongside a yellow Luma. She is one of three characters whose clothes change when riding on bikes, the other two being Peach and Daisy. To unlock her, obtain a one-star rank or better on all mirror mode cups or have a Super Mario Galaxy save file on your Wii and she will be unlocked after 50 races.

Super Smash Bros. Brawl rumor
In late 2007, when rumors were flying around like never before about Super Smash Bros. Brawl, one article claimed that Muddy was going to be an Assist Trophy, along with Muddy Mole and Duster. This claim was proven false upon the game's release.