Mario theory: Bowser is the real princess (Bowsette) and Peach is a cursed monster who stole the throne.

Theory Briefing

• The original NES manual states only Peach holds the magic to undo Bowser's curse, which the theory flips into evidence she's the one who cast it.
• Baby Peach appears in Yoshi's Island DS already living alone in a castle with zero royal lineage, unlike every other character whose origins are shown.
• In Paper Mario: The Thousand-Year Door, the Shadow Queen picks Peach as her vessel specifically because her body has a natural 'dark affinity.'
• The Super Crown turning Toadette into a human princess is reframed here as a relic carrying Bowsette's original form, not a random power-up.
• Bowser's habit of keeping Peach in furnished rooms rather than destroying the kingdom is read as a hostage negotiation, not a kidnapping.