|Debut||Majorika goes to Kindergarten|
Kumiko is a fair-skinned little girl with big grey eyes and dark blue-black hair pulled into low pigtails with short, straight cut bangs and two thin cowlicks. Originally she wore the Sonatine uniform with a dark blue skirt. Her normal attire afterwards consists of blue suspender-dress over a pale pink shirt to match her pale pink socks.
As one of Pop's closest friends; she is usually seen hanging around with her. She is normally cheerful and perky, and enjoys fantasy stories related to princesses.
- During episode 39 of Motto, she played Cinderella in the school play.
- Kumiko seems to be a reference to Aiko, like how Rie is like Hazuki, and Sayaka is like Onpu.