|Club|| Cooking (since 12/2/2015)|
|Persona|| Teacher's Pet (since 9/1/2017)|
|Appears||Week 1 (Debug)|
Before the February 8th, 2016 Build, Mei had cobalt blue colored hair worn in tritails, one on each side of her head and one in the back. She also had bangs in the same style as the default Yandere-chan. Her eyes were cobalt blue as well.
Before the May 2nd, 2016 Build, she had cobalt blue hair pulled back into a ponytail with strands of hair that hang to the right, some hair around her neck that reaches her shoulders, and bangs that curl inwards to her cheeks and dark blue eyes. Her bust size is 1.4. She wears blue framed reading glasses.
Before the December 18th, 2017 Build, Mei had blue hair tied in a small bun. Her bangs were longer on her right side, and she had an ahoge on the top of her head. She had a bang going down the middle of her face and another smaller one to the right of the larger bang.
As of the January 16th, 2017 Build, Mei wears a blue friendship bracelet on her right wrist.
As of the February 2nd, 2017 Build, Mei wears blue stockings and panties.
As of the December 18th, 2017 Build, Mei had blue hair tied back into tritails on the back of her head. Her bangs were parted to the right, with a blue hair clip partially holding them back.
As of the January 13th, 2018 Build, Mei's bun was restored.
Among the personas currently implemented in the game, she is a Teacher's Pet. She will give Yandere-chan a suspicious look if she aims her phone at her. If she sees a corpse or witnesses a murder, she will report to her teacher, unless another Teacher's Pet already has. She cannot participate in physical fights against murderers.
In her reference photo, she is shown to be studious, as she shown studying at a desk.
At 7:05 AM, Mei enters the school grounds. She walks to her locker at 7:10 AM and changes from her outdoor shoes to her indoor shoes. At 7:15 AM, she walks into the plaza, to the left side of the fountain, and gossips with Yui Rio, Yuna Hina, Koharu Hinata, Saki Miyu, and Kokona Haruka.
Mei walks back to class again at 1:30 PM and participates in cleaning time between 3:30 PM and 4:00 PM. Afterwards, she heads to the Cooking Club and stays there until 5:00 PM. She then heads to her locker and changes from her indoor shoes to her outdoor shoes, then she lingers there until 5:15 PM, when she walks home.
- Her name is a reference to the most popular female Japanese names in 2012, 7th most popular being Mei, 8th most popular being Mio.
- In older versions of the game, Mei's name was Tsumu Kotobu. The placeholder name was inspired by Tsumugi Kotubuki from K-ON.
- Her male counterpart is Ryusei Koki.
- The player can wear Mei's original hair by pressing H. It is the 5th hairstyle. Mei's second hairstyle is the 31st hairstyle available.
- Before the June 29th, 2016 Build, Mei used to arrive on school grounds 5th in line on the left side, at 7:05 AM.
- Mei's February 8th, 2016 hair is a reference to Eli Ayase from Love Live! The hair was changed because it was a recolor of a previously existing hairstyle.
- Originally Mei wasn't wearing her glasses because Yui Rio stole them; as of the September 1st, 2017 Build, she now wears them.
- Her hairstyle has been reverted back to her Bun as of the January 13th, 2018 Build, due to negative feedback from fans.
- To add her to the Science Club, YandereDev would have to change her appearance.
|“||Wow...that's pretty gross...I expected better from Kokona-chan...||”|
— Mei Mio on the Internet.