Mida has brown hair tied up in a ponytail and brown eyes. She wears a tight black suit jacket with her red bra slightly showing. She also wears a tight, short, scarlet skirt and a black garter belt. She wears red heels.
YandereDev states that she may be the tallest rival.
"Mida is a substitute teacher who absolutely loves her job; there is nothing that she enjoys more than having dozens of eyes all directed towards her...especially if those eyes belong to teenage boys.
Mida will appear at school in the seventh week of gameplay in order to fill in for an unavailable teacher. She will quickly begin hunting for new "prey", and Senpai will catch her attention.
Her hobby is seducing schoolboys, and so far, no man has ever been able to resist her charms. If she decides that she wants someone, they have no hope of escape. Senpai won't be able to escape her clutches unless someone takes drastic measures..."
Though it is unknown at the moment, YandereDev has said that her routine will put her in close proximity to Senpai or other students.It is presumed it will be the same as a regular teacher. In the future, she can be called upon by Teacher's Pets if they witness a murder.
- Main Article: Senpai
As she will be a rival in the future, she will have a crush on Senpai. She goes after him because she is finally ready to "settle down".
Senpai entering a relationship with Mida would be very complicated. He would eventually get a job in an academic institution.
- Main Article: Suitors
- If she is eliminated peacefully, she will disappear after her week is over.
- YandereDev may come up with a story related reason for Mida to stay, after her week is over.
- Her name is derived from "Midara" (みだら) which translates to "indecent" and "lustful". "な" (na) is an adjective-modifier.
- YandereDev has stated that Mida would likely leave a note for Senpai, put on a comically under-sized schoolgirl uniform and confess in an exaggerated "schoolgirl confessing to her Senpai" act.
- She won't have a reputation stat, but will instead have a 'job performance' stat, which will be lowered in ways other than gossip.
|“||I can teach you all sorts of things... Would you like me to be your..."private tutor"?||”|
— Mida in "Yandere Simulator Rival Introduction Video" 
|“||My, my! You really should be a bit more discreet about that sort of thing, darling. / You'd better be careful, dear... that's dangerous territory for a young woman. / Here's some advice, sweetie... next time, make sure that nobody is watching. / Goodness! You're bound to get into trouble if you keep that up, honey... / Tsk, tsk! You'll never learn unless you're punished for your mistakes. Come with me, sugar... we're taking a trip to the Guidance Counselor.||”|
— Hypothetical dialogue if Yandere-chan was found taking Panty Shots by Mida.
|“||Oh, myyyyy! Has someone taken a liking to me? *Giggle* / You know, dear, all you had to do was ask... / Is this pose better for you, darling~?||”|
— Hypothetical dialogue if Yandere-chan was found taking Panty Shots of Mida.