Mitsuki Koga (001)

Mitsuki has straight black hair, cut close to her shoulders, and straight bangs. Her eyes are slightly droopy, with a light gray tint, short eyelashes, and dark circles under her eyes. She has a distinctive mole under her right eye. She has nine piercings in her ears, four on the right and five on the left. Additionally, she has a tattoo on her left wrist, which resembles a sound wave.

She has a distinct alternative style, heavily influenced by musical subcultures such as grunge. Her wardrobe consists predominantly of dark, baggy clothing, such as graphic T-shirts, hoodies, and jeans. She accessorizes with various piercings, rings, necklaces, and chains. She also paints her nails with black nail polish and wears contact lenses. Her hair is usually tied in a low bun. Mitsuki's style leans towards an androgynous and masculine look, as she dislikes feminine clothing such as skirts, which she vows to stop wearing after high school. However, within the confines of school, Mitsuki tries to blend in and look as simple as possible. She avoids wearing any accessories that could be associated with her usual style, including rings or piercings, and even removes her nail polish. To cover up her tattoo, she wears a bracelet. She also wears oversized glasses and leaves her hair down.

Mitsuki is a reserved and taciturn girl, who is an introvert. She often finds herself distracted and can be a bit of an airhead. Due to her absent-mindedness, she can make flirtatious comments without meaning to. She becomes stressed after spending too much time around other people and becomes extremely nervous when she is in the spotlight. Mitsuki is prone to anxiety and has low self-esteem, which makes it difficult for her to accept friendships. She often isolates herself from problems or situations.
However, Mitsuki is a deeply caring person.