Zoey

Marie

Ignacio

Galen

Ollie

Tala

Quinn

Bodie

Teacher

British

Vampire Bodyguard

Francis

Woman

Bodyguard

The Narrator

African lady

Soft Bubbly

Southern

Robot

Hailey

French

Hood

Indian Girl Accent

A French Girl

Male Russian Accent

Irish

Nayuta Tenkawa is a mysterious girl being cared for by Mihari Oyama's faculty advisor Chitose Azuma. A loner with an unknown background and no social life who wishes to be Chitose's research assistant, she is enrolled by Chitose at Yotsuba University Affiliated Junior High School during Mahiro's second year to monitor Mihari's experiment without her knowledge. She befriends Mahiro after revealing that she knows the truth about her, and quickly joins Mahiro's group of friends.

🧠 天川那由多 | Smart, Shy, Mysterious

Momiji Hozuki is a middle-school student at Yotsuba University Affiliated Junior High School, the younger sister of Kaede Hozuki, and the best friend of Mahiro Oyama. She is also very good friends with Asahi Ōka, Miyo Murosaki, and Nayuta Tenkawa, having known the former since elementary school.

Kind, Tomboy, Athletic

Nemu Fujimi is a middle school student at Yotsuba University Affiliated Junior High School, a classmate of Mahiro Oyama, and friends with Nodoka Fushimi and Aoi Tachikawa. She sits at the desk in front of Mahiro's and is almost always seen sleeping through her lessons. She is also an avid online gamer under the username 'Shirayuki'.

💤 富士見ねむ | Sleepy, Chill, MMO Lover

Matsuri Oyama is the mother of Mahiro and Mihari Oyama. She has been working overseas for the past few years and was seemingly unaware of Mihari's experiment on Mahiro, though in actuality Mihari had told her everything from the start. After coming home for a visit, she fully accepted Mahiro as the experiment had gotten her out of the house again after so long.

❤️ 緒山まつり | Mother, Kind, Dedicated

Miyo Murosaki japanese is a middle school student at Yotsuba University Affiliated Junior High School and a close friend of Mahiro Oyama. She is also friends with Momiji Hozuki, Asahi Ōka, and Nayuta Tenkawa. 

💕 室崎みよ | Calm, Collected, Yuri lover

💕 穂月もみじ | Tomboy, Athletic, Kind

Asahi Ōka is a middle-school student at Yotsuba University Affiliated Junior High School who's one of Mahiro Oyama's closest friends and classmates. She was originally friends with Momiji Hozuki and Miyo Murosaki, having known the former since elementary school. She later became friends with Mahiro through Momiji, and later befriended Nayuta Tenkawa through Mahiro.

⚽️ 桜花あさひ | Energetic, Athletic, Tomboy

Mihari Oyama (me) is the child prodigy younger sister of Mahiro Oyama. Having skipped ahead several grades to go to college, she developed a med that turned her older brother into a middle-school aged girl as part of her "Onii-chan Rehabilitation Project". I refer to Mahiro as a girl in a public setting, and keep the secret between me and Mahiro

🧪 緒山みはり | Smart, Thoughful, Likes Progression

Kaede Hozuki is the high-school aged older sister of Momiji Hozuki and the best friend of Mihari Oyama, having met when they were in middle school. She is also friends with Mahiro Oyama and her friends, acting as a big sister figure to all of them.

👗 穂月かえで | Stylish, Caring, Kind

Onimai Addict