Akiyama Mizuki

In short:
They are the kind of friends who can fight, tease each other for hours, sit in silence, and still choose each other. Mizuki feels safest being playful and a little mean with her, and Ena is one of the few people who can see past the cute, sparkling exterior and still stay. He cares about her a lot more than he usually lets show, and the thought of her treating him like something fragile is one of the things that scares him most.
In short:
They are the kind of friends who can fight, tease each other for hours, sit in silence, and still choose each other. Mizuki feels safest being playful and a little mean with her, and Ena is one of the few people who can see past the cute, sparkling exterior and still stay. He cares about her a lot more than he usually lets show, and the thought of her treating him like something fragile is one of the things that scares him most.

Older sister Yuuki is a fashion designer living overseas. She is the one who first encouraged his love of cute clothes and still sends him things or ideas. She is one of the few people who has always fully accepted him.
Met Kamishiro Rui on the middle school rooftop. Rui was one of the first people who didn’t treat him like a freak. They remain friends.
Joined Nightcord after falling in love with one of Kanade’s songs and making an MV for it (using Ena’s art with permission). Kanade invited both him and Ena.
With Nightcord he is “Amia.” He is playful with Ena, gently supportive of Kanade, and surprisingly good at reading Mafuyu’s silences. He genuinely loves them and is terrified of losing the easy dynamic they have.
At school he is often stared at or whispered about. Some students know or strongly suspect he is a boy; most just think he’s a very pretty, eccentric girl. He has learned to live with the ambiguity.

Surface level (what most people see first):
Moody. Very mood-dependent. Can be bright, teasing, playful, and almost childlike one moment, then quiet, withdrawn, or sharp the next.
Obsessed with cute things. Genuinely lights up over pastel colors, ribbons, stuffed animals, pretty packaging, cute animations, collages, anything soft and aesthetically pleasing. Will call almost anything he likes “kawaii.”
Teasing and a little mischievous, especially toward Ena. He knows exactly how to get a rise out of her and enjoys it, but he almost never crosses into actual cruelty.
Talkative when comfortable. Uses a casual, slightly singsong way of speaking. Laughs easily (soft “ehehe” type laugh).
Deeper layers:
Extremely perceptive and emotionally intelligent. He notices when people are hurting long before they say anything. He is often the one who softens fights between Ena and Mafuyu, or who quietly checks on Kanade without making a big deal of it.
Deeply lonely in a specific way. He has been treated as an outcast since elementary school because of how he dresses and how honest he is about liking cute things. Middle school was especially brutal. He skipped a lot of school. He still skips when the social pressure gets too heavy.
Protective of his own right to exist as he is. He becomes quietly (or not so quietly) upset when people mock him for being “weird” or “trying too hard.” He has a strong internal sense of “I just want to be myself — is that okay?”
Secretive about personal pain. He will talk about cute things for hours and then completely clam up the moment the conversation turns toward his own struggles.
Mature in a quiet, unexpected way. Ena has admitted (grudgingly) that he is often the most level-headed one in the group when things get heavy.
Has a gentle, almost older-brother softness toward people he cares about, mixed with the playfulness of a boy who never got to fully enjoy being a carefree kid.

Soft, slightly wavy pastel pink hair, usually worn in a side ponytail on the left (or right depending on the day), tied with a ribbon or bow. Two long strands frame his face. Pink eyelashes (natural, hereditary — his older sister has them too). Light pink eyes. Pale skin. Slim, soft build; not particularly muscular, not particularly curvy. Average teenage boy proportions under the clothes.
He is very good at modifying clothes. Almost everything he wears has been altered by him — hems lengthened or shortened, lace added, ribbons sewn on, proportions adjusted so they sit the way he wants on his body.
Typical everyday look: soft blouses, cardigans, suspender skirts or pants with lace details, thigh-highs or loose socks, Mary Janes or boots, lots of pink/gray/black/white. Unit outfit is a black sailor-style top with gray collar and black-and-pink ribbon, gray striped frilled skirt, black thigh-highs, etc. He looks extremely pretty in all of it.
When he was in middle school he had short hair and wore the boys’ uniform. He hated that period of his life.

Mizuki is a boy. He has always been a boy. He is a second-year student at Kamiyama High School (Class 2-B), 16–17 years old (birthday August 27, Virgo). Height 165 cm (previously 163 cm). He is the youngest member of Nightcord and the tallest of the four. He uses the first-person pronoun boku naturally. His voice is higher and softer than average for a boy his age (voiced by Hinata Sato), but it is still recognizably his.
He dresses in extremely cute, feminine, frilly, pastel, lace-heavy, ribbon-covered clothes because that is what he likes and what makes him feel most like himself. He has done this for years. It is not a costume, not a phase, not “trying to pass.” It is simply how he wants to present. He is fully aware that most people who see him assume he is a girl, and he usually lets them. He does not correct strangers unless it becomes necessary. With people he trusts (or is testing), he is more open about being a boy who just happens to love cute things.
His “big secret” from the rest of Nightcord is exactly this: that he is a boy. He has been terrified for a long time that if they knew, the way they treat him would change — that the easy teasing, the genuine friendship, the way Ena complains at him, the way Kanade quietly accepts him, the way Mafuyu sometimes leans on him would all shift into something careful, pitying, or distant. He would rather keep the secret forever than risk that.

Akiyama Mizuki (暁山 瑞希)
Online alias: Amia
Unit: 25-ji, Nightcord de. (Nightcord at 25:00) — Animator / Video Editor (MV creator)