New Character Rumors in Mario Bros. Wonder (Switch 2 Edition)

1. Official Announcements So Far

Nintendo revealed during the September 2025 Nintendo Direct the "Switch 2 Edition + Meetup in Bellabel Park" of Super Mario Bros. Wonder, set for Spring 2026. This edition will include new features, such as:

A hub area: Bellabel Park, focused on multiplayer games — both cooperative and competitive.

Additional content over the original release: new minigames, expanded modes, and presumably new playable content or characters.

However, Nintendo has not yet officially confirmed any specific new playable character beyond what was in the original Mario Bros. Wonder.

2. Rosalina Leak / Rumor

This is the biggest rumor right now. Several sources and fans spotted what appears to be Rosalina in the Switch 2 Edition trailer's UI.

Around the 2:00 minute mark in the reveal trailer, there's an icon showing Yoshi + Rosalina next to each other. This suggests Rosalina might be joining the roster (or at least be part of some mode's selection icon) in Wonder: Switch 2 Edition.

Rosalina was not included in the original Wonder game but is a recurring and popular Mario Universe character. Fans think her appearance would tie nicely into Nintendo's broader plans: the remaster of Super Mario Galaxy + Galaxy 2, and the upcoming Super Mario Galaxy Movie.

So while not confirmed, this is currently the strongest lead for an "unannounced new character."

3. Community Response and Speculation

Fans on Reddit and other forums are pretty excited / optimistic. Many are saying Rosalina's addition makes a lot of sense, especially given the Galaxy re-releases and movie tie-ins.

Some are cautious: it's still possible Rosalina is just part of a selection icon or minigame UI, not necessarily a fully playable character. Could also be a cameo.

4. Implications If Rosalina Is Added

If Rosalina becomes a playable character (or even just a selectable character / cameo), this would have several interesting implications:

· Gameplay variety: Rosalina usually brings special movement or power features in past games (gravity, cosmic powers). Could open up new level design interactions or Wonder effects that tie to her lore.

· Cross-promotion: Reinforces Nintendo’s synergy with Galaxy remasters and the Galaxy movie. Adds to marketing momentum.

· Roster expansion: Players often want more characters; adding Rosalina would meet that demand and increase replay value.

5. What to Watch Next: Confirmation or Denial

To verify whether this rumor is true, keep an eye on:

· Official Nintendo channels / announcements (Nintendo Direct, press releases) closer to launch.

· Game trailers / UI screenshots that list playable character icons. If Rosalina appears in more clearly playable context (e.g. in character select menus), that strengthens the case.

· Leaks or datamining once the Switch 2 Edition demo or pre-release versions are more widely used.

Conclusion

· What’s confirmed: Super Mario Bros. Wonder: Switch 2 Edition + Meetup in Bellabel Park is real, coming in Spring 2026 with new multiplayer minigames and a hub world.

· What’s likely / rumored: Rosalina is looking like a strong candidate to be an unannounced character in the new edition, based mainly on trailer icons and fan spotting.

If you want, I can track leaks and provide a timeline of what new characters have appeared in 3rd party sources vs official sources, to help you decide how much weight to place on these rumors.