The Super Mario Bros Movie Franchise

The Super Mario Bros. movie franchise, produced by Nintendo and Illumination, has become the highest-grossing film franchise based on a video game. Following the massive $1.36 billion success of The Super Mario Bros. Movie (2023), a sequel titled The Super Mario Galaxy Movie was released on April 1, 2026, establishing a major animated cinematic universe.
Rosalina is depicted as having a deep desire to protect Princess Peach and to be together with her.
In this film continuity, their relationship is significantly different from the games.
Sisters' Bond: Rosalina and Peach are confirmed to be sisters who grew up together on a distant planet.
Desire to Protect: When dark forces (Bowser Jr. and Kamek) targeted them for their cosmic power, Rosalina made the difficult decision to send an infant Peach away through a warp pipe to safety in the Mushroom Kingdom. This act was specifically designed to keep her sister safe while Rosalina remained behind to guard the cosmos.
Reunion: Rosalina serves as the guardian of the Comet Observatory and spends the film trying to protect her new family (the Lumas) before eventually reuniting with Peach.
Combined Power: At the end of the film, they are reunited, and their desire to be together is shown through their combined cosmic powers, which they use to transform Planet Bowser into a peaceful, lush world.
Based on 2026 reports regarding The Super Mario Galaxy Movie, Princess Daisy is implied to be the long-lost sister of Princess Peach and Rosalina. The movie reveals Peach and Rosalina are sisters made of stardust, and the post-credits scene featuring Daisy, combined with flower imagery, suggests she is part of their family.
Key Details from The Super Mario Galaxy Movie (2026):
Sibling Connection: The movie reveals Peach and Rosalina are sisters, and Daisy is introduced in a post-credit scene as part of their family line.
Symbolism: When Peach and Rosalina combine their powers, they create daisies, foreshadowing Daisy's role.
Origin: The plot indicates they were separated at a young age.
Making Princess Daisy the long-lost third sister would perfectly mirror the official film canon.
If Daisy is revealed as their long-lost triplet or younger sister in the third movie, here is how her introduction could unfold:
Cosmic Origins
If Daisy was separated from Peach and Rosalina as a baby—just as Rosalina hid Peach away to protect her from a cosmic threat—Daisy could have been stranded in a completely different realm, such as the deserts of Sarasaland. Her arrival would complete a powerful "Tri-Sister" cosmic trio that could battle massive, universe-level threats.
Story Dynamic and Action
Adding Daisy would completely shake up the group dynamic:
The Tomboy Energy: Daisy’s feisty, spunky, and energetic personality would contrast perfectly with Peach's regal grace and Rosalina's cosmic calmness. The "Chosen One" Plot: The sisters could discover that only when all three of them unite their royal and cosmic powers can they restore peace to the cosmos or defeat major villains Fans have always paired Daisy with Luigi. Introducing Daisy could give Luigi a major storyline of his own, where he helps her acclimate to the Mushroom Kingdom, bringing a lot of comedic value and sweet romantic moments.