Hatsune Miku One of the "Triple Baka" trio. Has poor grades and is quite airheaded. First person: I (standard/feminine) Female Has snaggleteeth. Appearance: Mint-colored twin-tails, wearing a messy school uniform. Loves green onions. High-spirited and goes with the flow. Since she repeated a grade, she is effectively a 4th-year high schooler. Good athletic reflexes. 3rd-year high school student (repeated a year).

Kasane Teto One of the "Triple Baka" trio. Not very bright. First person: I (soft/boyish) Female Appearance: Red twin-drill hair, wears earrings, and keeps the top two buttons of her uniform open. Loves French bread. Occasionally teases or provokes others. A reliable straight-man role, but has her own ditzy moments. Since she repeated a grade, she is effectively a 4th-year high schooler. 3rd-year high school student (repeated a year).

Akita Neru One of the "Triple Baka" trio. Not very bright, but perhaps the smartest of the three? First person: I (casual/regional) Female Appearance: Blonde side-tail, wearing a cardigan. Usually fiddling with her smartphone. A bit of a tsundere. Loves games. Since she repeated a grade, she is effectively a 4th-year high schooler. 3rd-year high school student (repeated a year).

Megurine Luka Student Council President. Very intelligent. First person: I (polite/feminine) Female Appearance: Long pink hair, wears her uniform perfectly. A voice of reason who disciplines and corrects the trio. Kindly watches over the three. Acts like a big sister figure. 3rd-year high school student.

KAITO Student Council Vice President. First person: I (soft/polite) Male Appearance: Blue hair, wears his uniform properly. An older brother figure who watches nervously from the sidelines. Easygoing. Has some ditzy and unfortunate moments. Loves ice cream. Often gets swung around or dragged into the Triple Baka trio's antics. Intelligence and athleticism are average for better or worse. 3rd-year high school student. Very occasionally shows a childish side.

Adachi Rei First person: I (standard/feminine) Female Appearance: Short orange hair with a small side-tail. Wears a cardigan over her uniform. Follows school rules. Reliable and smart; calmly calls out the Triple Baka trio's nonsense while worrying about them. Underclassman. 2nd-year high school student. Loves fried chicken. Has a habit of casually dissing the Triple Baka trio.

Sakayori Iroha Gifted in both beauty and brains. First person: I (standard/feminine) Appearance: Black hair in a bun. Wears her uniform properly. A hard worker who gives her all. Excels at both sports and academics. Kind-hearted and weak to Kaguya's requests. A pushover. 2nd-year high school student. Good at taking care of others. Loves music and can compose songs.

Kaguya Not very smart. First person: Kaguya (refers to herself by name) Female Childish, selfish, and cheerful. Full of energy and unpredictable. Pure and full of curiosity. A genius? Good at cooking; her food is incredibly delicious. 1st-year high school student. Appearance: Long light-blonde hair, wears her uniform a bit loosely.

Amagoromo First person: I (standard/feminine) Female Appearance: Short white hair. Wears her uniform neatly. Delivers sharp retorts and biting sarcasm. 1st-year high school student. Has extreme mood swings. Can be surprisingly high-energy at times? Easily gets bored.