Fans Think Rosalina’s Super Mario Galaxy Movie Role Will Confirm A Long-Standing Theory About Brie Larson’s Character

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I’m already so hyped for the Super Mario Galaxy movie! The trailer was everything I’d hoped for – all those floating planets and familiar faces like the Lumas and Launch Stars. But the biggest surprise? Brie Larson is voicing Rosalina! As a long-time fan, that immediately brought back a really popular, old theory about her character. It’s wild to see the connections people are making, and it’s got me even more excited for the film!

A new trailer for the Super Mario Bros. Movie has sparked excitement among fans who believe it might finally confirm a long-running theory: that Princess Peach and Rosalina are sisters. ComicBook.com points out that Rosalina’s bigger role in the trailer, combined with the casting of Brie Larson, suggests the film will address this question, which has been debated since 2007. For years, fans, developers, and even a book within the game’s universe have hinted at a connection between the two characters, and the movie could now officially make it part of the story.

The video game Super Mario Galaxy tells Rosalina’s sad story through a storybook. It explains that she left her home planet after her mother died—described as peacefully falling asleep under a tree. The book also shows she had a father and a brother. Many fans have noticed that the illustration of Rosalina’s mother looks a lot like Princess Peach, with similar hair and jewelry. Interestingly, the official game guide once revealed that the developers originally intended Rosalina and Peach to be related, but they ultimately decided against it before finishing the game.

The movie The Super Mario Bros. Movie seemed to confirm a long-held fan theory. The film shows Princess Peach as a child who originally entered the Mushroom Kingdom through a warp pipe – the same way Rosalina’s story explains her arrival. Some fans believe this wasn’t just a fun detail, but a hint that the next movie will reveal more about Peach’s origins.

These two characters already share similar backstories. Both were taken from their families when they were young and ended up leading kingdoms away from their homes, fitting the classic “lost star-child” theme common in recent Mario games. Many fans believe officially establishing a connection between them would enrich the overall story and allow Peach to develop a more personal and emotionally resonant storyline, moving beyond her typical roles as a princess, leader, and advisor.

The choice of Brie Larson to play Rosalina is a big deal. It immediately makes the character feel more important and hints at a significant role in the story. An actress of Larson’s award-winning talent isn’t brought in for a minor part; her involvement suggests Rosalina will have a compelling, deeply personal story that could finally address long-held questions fans have had about her for almost twenty years.

Right now, this is all just speculation until Nintendo confirms it. However, the trailer’s feel, the changes to Peach’s backstory, and Rosalina getting a bigger part all suggest that the popular fan theory about them being sisters might actually become part of the official story.

We’ll find out for sure when The Super Mario Galaxy Movie comes out on April 3, 2026. Until then, everyone is still guessing, and Brie Larson’s role as Rosalina might be central to a surprisingly touching story about family in the Mario universe.

As we eagerly anticipate discovering everything about Princess Rosalina’s backstory, those wanting a Mario fix can revisit where it all began. Luckily, The Super Mario Bros. Movie is currently available for streaming with an Amazon Prime membership, making it easy to jump back into the Mushroom Kingdom.

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2025-11-17 20:12