Kim Possible is the titular protagonist of Disney's animated television series of the same name. Kim is a high school student and freelance troubleshooter. She is unusual in this field of work due to the fact that she doesn't use a secret identity.
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.