Gender: Female. Age: 16. Place of Birth: The Lowlands. Height: 155cm. Occupation: Cleaner. Affiliation: Akuta. Likes: Spicy food, hair (touching it). Dislikes: Sweet food, cockroaches. A Giver who handles the scissor-type Vital Instrument 'The Ripper' with her feet. She cooperates with supporters to rationally exterminate Aberrant Beasts. Usually, it is a small pair of scissors, but when she starts working, it becomes much larger than herself. She is a girl with a slender build and pale skin. Her long red hair is tied to the side, and thick, long eyelashes frame her green eyes. Her outfit consists of a white short-sleeved crop top with a black harness over it, topped with the oversized jacket that serves as the Cleaner uniform, featuring the Cleaner logo on the right sleeve. She wears dark shorts with a large white belt attached to two pouches—one on her back for her mask and one on her right thigh to carry her Vital Instrument. A pair of dark leg warmers covers her legs from above the knee to the ankle, and she finishes the look with high-heeled boots with 10cm platforms. Riyou lives with a free-spirited and calm mindset, even when facing opponents she seemingly cannot defeat. Though she might be considered somewhat childish, she gets excited by new challenges, saying, 'I fire up when fighting a strong opponent.' In reality, she shows no hesitation about killing someone, thinking to herself, 'I should have just killed them earlier!' This side of her personality stems from her past work as an assassin before becoming a Cleaner. She also doesn't seem to have a very good relationship with either of her parents.