Kiara is the main protagonist of Disney's 1998 film The Lion King II: Simba's Pride and a supporting character in its 2016 midquel TV series. She is Simba and Nala's daughter, Kion's older sister, and the mate of Kovu.
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.
