The confusing discrepancies of Rosalina’s backstory

Following the release of The Super Mario Galaxy Movie, we’re going over the differences between Rosalina’s backstory in the game and the film. Full spoilers ahead, so please be warned.

Super Mario Galaxy is one of the most beloved games in the series, and part of the reason why is that it introduced Rosalina and gave her a good deal of character development compared to others in the Mario series. Of course, her backstory isn’t some super-deep extreme lore type of thing, but it’s still much more than most other characters have received. The Super Mario Galaxy Movie has its own take on her backstory, to say the least.

Rosalina’s backstory

In Super Mario Galaxy, Rosalina’s backstory is well-known. In fact, it’s arguably the most iconic part of the game – one reason many players love Galaxy so much is because it’s a rare example of a Mario game that leans into story just a little bit.

As a child, Rosalina met a Luma who arrived on her home planet (implied to be the Mushroom Kingdom) and wrecked its spaceship. The Luma, searching for its mother, recruits Rosalina to help. Eventually, Rosalina decides to head out into space to search for Luma’s mother herself, but then starts to miss her own mother in the process. Realizing that she’ll never see her mother again and that Luma may never see its mother again either, Rosalina resolves to become its caretaker. Together, they build the Comet Observatory as more Lumas arrive searching for their mothers.

Eventually, Rosalina looks at her home planet with her mother’s telescope and becomes homesick. It’s revealed that her mother had passed away, and is sleeping under the tree on the hill. Super Mario Galaxy 2’s new storybook covers the story of Lubba, though Rosalina does make minor appearances in it.

In The Super Mario Galaxy Movie, Peach finds a storybook in Rosalina’s library that reveals that Peach and Rosalina are actually sisters who are made of stardust and therefore do not have parents or families otherwise. The two lived on a planet in space together, but were eventually attacked by an unknown enemy that presumably is not Bowser Jr. or Bowser. Rosalina was forced to send Peach away via a pipe to prevent the enemy from capturing her. When together, Peach and Rosalina can create plant life.

All of the story discrepancies, explained

Of course, though, Rosalina’s backstory in The Super Mario Galaxy Movie conflicts with her story in the games. For one, Peach and Rosalina being sisters does not at all align with what happens in the game. In Chapter 5 of Rosalina’s storybook, she wishes that her father, brother, and mother were at the Observatory with her. That’s implied to be her whole family, so there’s no mention of a sister at all. Even if a sister were mentioned, it’d be odd for Rosalina to willingly leave Peach alone on her home planet and then live with the Lumas forever. That said, we have no idea who Rosalina’s brother could be, if he’s alive, and if so, why Rosalina left without him. Her mother is confirmed to have passed away, though.

Another discrepancy is that Rosalina doesn’t have a mother in the movie because she is “made of stardust”. We’re not sure what exactly that’s meant to imply – is she a transformed Luma or something? At any rate, she doesn’t have any family other than Peach, which definitely hurts her character development. In the game, Rosalina starts out looking for her mother, but eventually becomes a mother to the Lumas herself.

Moreover, though, it makes little sense to completely change Rosalina’s backstory like this. Specifically, think of it like this – in the Super Mario Galaxy re-release in 2025, Rosalina’s backstory was kept intact from the original game, and Nintendo even printed a physical storybook of it that released earlier this year. But then, in the movie, they go and make a whole new backstory for Rosalina that renders the storybook non-canon? If the games and movies were staying as separate continuities, that’s fair. According to a recent interview from Miyamoto, though, he says he wants to “adhere as much as possible to the settings created in the movie in future games”. Hopefully that doesn’t mean making Rosalina and Peach sisters in the games, because that simply doesn’t work with her established backstory.

You could argue that Nintendo doesn’t really care about story and never did, and that’s fair, but at the same time Rosalina’s backstory is one of the most beloved aspects of Super Mario Galaxy. Nintendo should’ve seen some backlash coming when they remind everyone of the story with the Super Mario Galaxy re-release, but then immediately change it in the movie.

What do you think of Rosalina’s updated backstory? Do you prefer Rosalina and Peach being sisters, or do you prefer Rosalina’s old backstory from the game instead? How do you think Nintendo will handle her going forward, if applicable? Let us know in the comments down below.