Princess Catania (simply known as Catania) is the deuteragonist in the 2013 animated film, Barbie: Mariposa & the Fairy Princess. She is the princess of Shimmervale and the daughter of King Regellius.
Vote which fictional character would naturally fit in-universe with a big-named franchise! No time-travel, no interdimensional crap, no "Pooh's Adventures", they would just exist in-universe.
