Rosalina’s Super Mario Galaxy Movie Debut Drops 4 Clues She’s Related to Princess Peach

Mario is going cosmic again. The next animated chapter in this franchise is the Super Mario Galaxy movie, and yes, Rosalina is finally joining the party. Brie Larson is set to voice her, and the whole thing is positioned as a sequel to the hit The Super Mario Bros. Movie. If you know your Nintendo lore, Rosalina first showed up in the Super Mario Galaxy games, so this is a pretty natural bridge from the last movie to a bigger, weirder universe.

Are Rosalina and Peach actually related?

Fans have been connecting those dots for years, and Nintendo has never officially said yes or no. But there are a few breadcrumbs from the games and the first movie that keep this theory alive:

• The lookalike factor: Peach and Rosalina share the same broad-strokes design language: blonde hair, blue eyes, and a vibe that suggests family resemblance. Neither character’s full origin is spelled out on-screen, which only fuels the sister speculation.
• Peach’s flashback in the last movie: When the previous film dipped into Peach’s childhood, baby Peach was surrounded by stars and moons. That celestial imagery lines up with Rosalina’s whole cosmic deal, hinting Peach might come from a similarly starry place — maybe even the same one.
• The storybook in Super Mario Galaxy: The in-game storybook that fills in Rosalina’s backstory introduces her mother, who looks a lot like Princess Peach. It’s not definitive, but it’s a strong nudge toward some kind of familial connection — potentially the same mother.
• Nintendo once considered it canon: At one point, Nintendo reportedly planned for Peach and Rosalina to be related within the same continuity. That plan never fully materialized, but the idea was on the table, which makes it fair game for the new movie or whatever comes next.

None of this locks anything in, to be clear. Nintendo hasn’t confirmed the relationship, and the movies can remix details however they want. But with Rosalina stepping into the spotlight — and Brie Larson voicing her — this sequel is a prime chance to finally address the Peach/Rosalina question while diving deeper into both backstories.