Ryūko has a relatively simple personality: fierce and stubborn. When Ryūko wears Senketsu Kisaragi, Senketsu's eyepatch is broken, revealing his hidden eye, his color scheme changes to reddish-orange and yellow, the headpiece becomes more elaborate like a rabbit's ears, yellow energy bands form a skirt that looks like jaws around Ryūko's waist and her hair becomes blond. Her legs are also covered with thigh-height, high-heeled boots. The top armor piece is connected to her skirt by three red garter belts/suspenders (two in front, one in back), leaving everything between the underside of her breasts and her waist exposed. The top section of the armor covers Ryūko's neck, lower jaw, arms, and upper breasts, and possesses a red, triangular ventilation grill centered on Ryūko's upper back. Senketsu himself also undergoes a significant change in appearance after Synchronization his 'eyes' extend into wing-shaped crests jutting out from Ryūko's shoulders and his upper and lower parts transform into a black, skimpy suit of armor with red stripes. Her hair becomes even more feathery and is accented with vibrant red undertones and horn-like clips. Ryūko's appearance changes further when using Life Fiber Synchronize with Senketsu. Aikurō Mikisugi later provides her with a Seki Tekkō, a red, finger-less, left-handed glove with a built-in syringe designed for Ryūko to conveniently draw blood and feed it to Senketsu. Her skirt (Senketsu's lower jaw) is held up by suspenders attached to a belt. Her sailor-style collar with red stripes is tied by a multicolored scarf that also serves as Senketsu's left 'eye.' Senketsu's right eye is covered by a black 'eyepatch' with an X-shaped scratch over it (perhaps emulating her father's right eyepatch). Her shirt (Senketsu's upper jaw) is a crop top with mid-length sleeves that bares her midriff. Her clothing is later replaced by Senketsu, a living navy blue sailor uniform. During her childhood, she wore a red collared shirt with a white skirt and white shoes. Her outfit at the start of the series is a simple white shirt with a red ribbon tie, a black miniskirt, white sneakers, and a black & white jacket with rolled-up sleeves. Her blue eyes have peculiar gear-like pupils with eight grooves around the edges. Ryūko is a seventeen-year-old girl of medium height and mid-length dark-blue tinted hair with a single left-swept red highlight on her bangs. Bent on finding this mysterious woman, Ryuko sets out in search of the owner of the other half of the Scissor Blade. Ryuko only caught a glimpse of the female attacker, and Isshin passed on the Red Scissor Blade that he had been stabbed with.

One day when she returned home to respond to a letter he had sent, she found Isshin on the verge of death. She was sent to a boarding school at a young age and rarely saw her father, Isshin. She was thought to have died in the lab, but she was secretly raised by Isshin Matoi, who was actually a disguised Soichiro. When their experiments on her older sister failed, they then attempted to bond Life Fibers to her almost immediately after birth. Unknown to Ryuko for most of her life, she is the second-born daughter of Soichiro and Ragyo Kiryuin.

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