Riko's best friend.
Very upbeat and spunky, as well as practical and logical. She is loyal to her comrades, especially Riko.
Yuki's gauntlets are actually quite normal, but she can "manufacture" weapons out of slots on her shoulder and hip plates. Her hair isn't very prehensile, but she makes up for it with the ability to create any type of bladed weapon, from throwing knives to katana to surgical blades.
Yuki first met Rihoko on an outing sponsored by her mother's newspaper company, and they quickly bonded. After the Battle of Tokyo Tower, Yuki and Rihoko became best friends, and Yuki's mother wed Yuusuke Tozawa, making him become Yuki's stepfather.
Yuki was two grades ahead of her best friend, but they always managed to hang out together.
Now, Yuki has enrolled in the XTC along with Riko, and the two of them have managed to make it onto the same squad.