Kasumi Tomine (遠峰 かすみ Tōmine Kasumi) is one of the main characters in Alien Nine. She is a "genius-type" sixth-grade student, who is talented in piano, ballet, chess, robotics competitions and roller skating. She is the most enthusiastic member of the Alien Party. Kasumi has a brother, whom she greatly loved and who was sent to a private school abroad. In the manga, after being absorbed by a Yellow Knife alien, she becomes part Yellow Knife herself, though hinted at in the anime.