Arata takes the appearance of teenage girl with brown eyes and also brown hair ending in short pigtails. She wears a red school gym uniform and white with blue stripes shoes.
She is extremely rash to the point where she forced Mato to sprint even though she was only showing interest in the basketball club. She is also fond of draconian training, and supposedly nobody is able to play against her one-on-one.
She is very hyper and bold, and very tomboyish. However, she has many insecurities, but she tries to cover them up by acting strong. She believes that she shouldn't blame anything bad on anyone else, since that would mean that they would be the ones having responsibility for fixing it and she wishes to take on that responsibility.