Peach

Peach is the queen of the Mushroom Kingdom, the girlfriend of Mario, the best friend of Zelda, the younger sister of Percy and a protagonist in Nintendo Puppets

She helps save Mario, Luigi, and Zelda when a bad guy kidnaps them. Sometimes she gets kidnapped too.

Biography
She was formerly "Princess Peach" when her eldest brother, Percy was king. After his death, Peach became queen.