Kyoko Kirisaki

 Kyoko Kirisaki is an immature, teenage high-school student who serves as an antagonist in the manga Black Cat and its anime adaptation. She is one of the first members of the Apostles of the Star to be introduced in the series, though the fact that she belongs to the terrorist gang is actually her only villainous trait. She acts and even kills for the sake of fun (without realizing the full extend of her actions) instead of being motivated by sheer malevolence and she is without a doubt the most "innocent" of the group. She ultimately defects from the Apostles along with her friend and partner Sharden Flamberg, and meets the primary protagonist Train Heartnet, with whom she falls in love. She ultimatelly reforms and return to a normal teenage life in her country.