Chiyuu is the high school friend of Birthday and Ratio. She has synesthesia.
Chiyuu has violet shoulder length hair styled into two pigtails at the front, pale skin, and violet eyes. She wears a black tanktop underneath a green shoulderless shirt with a yellow bow on the front, blue cropped pants, and pink sandals.
Not much is known about Chiyuu's personality, but she seems to be quiet and somewhat introverted. She only speaks in colors. She is compassionate towards others, seen when she rescued a person from being harassed for being related to a Minimum Holder. She is also willing to side with Freemum in order to find the Healing Minimum for Birthday's sake.
Chiyuu was a good friend to Birthday and Ratio after they dropped out of Facultas Academy. She kept her Minimum very secret.
Hamatora: The Animation
The Prophet's Lament
Chiyu begins working with a western artist, though she soon finds herself kidnapped by Ratio and Birthday.
March of the Weak
Chiyuu uses her minimum to turn herself and a friend invisible when they are attacked by rioters. She exhausts her power doing so and becomes visible to the rioters, who badly beat her.
Flight of the Victor
Ratio finds the injured Chiyu and has her treated.
Powers & Abilities
Invisibility Minimum: It is speculated that Chiyuu's powers are related in manipulation of color, which she uses to blend in/camouflage with her surroundings. She can use that power on herself and up to one other person, but the later weakens her when she stops using her minimum. She activates her power by tapping her foot two times on the floor. We don't know if she already had her minimum or that it was given to her by Moral.
*The name of her minimum is not officially given.