is a 17-year-old schoolgirl who transfers to Honnouji Academy in search of clues relating to the death of her father. She wields half of the Rending Scissors

(断ち斬りバサミ Tachikiri Basami)

, one-half of a giant pair of scissors created by her father with the other half stolen by his killer. Her weapon is capable of destroying uniforms empowered by Life Fibers.

At the start of the series, she acquires a special "kamui" uniform named Senketsu, which grants her special abilities.

She lives with the

.

During the battle at the Honnouji Academy Cultural & Sports Grand Festival, it is revealed that Ryuko is Ragyo's presumed dead daughter and Satsuki's younger sister.

Ryuko was merged with Life Fibers when Ragyo Kiryuin performed an experiment to fuse Life Fibers into humans