Princess Chesterina is a character who appears in the PC version of The Fairly OddParents: Breakin' Da Rules. She is a young girl who appears in the Mighty Breath Man video game and bares an uncanny resemblance to Chester McBadbat.
In Breakin' Da Rules, Timmy wishes himself inside the Mighty Breath Man video game to find Da Rules. To clear the level, Timmy, as Mighty Breath Man, has to defeat the game's villain, Le Foot, and rescue Princess Chesterina.
Chesterina looks exactly like Chester, but has longer hair behind her head, and wears a pink princess dress.