Age: 17
Girlfriend no. 10

Mimimi is a self-proclaimed beauty, with long flowing blonde hair and narrow teal eyes with long eyelashes.

Mimimi is very haughty and narcissistic, consistently complimenting herself and talking about her beauty. She is obsessed with beauty to the point that she takes it upon herself to make Rentarou beautiful as well once she meets him. While believing herself to be almost unparalleled in her looks, she is very competitive to the one person she admits surpasses her—Eiai Nano.

Despite her appearance of a naturally-beautiful rich girl, Mimimi actually works incredibly hard to provide for herself and keep herself beautiful. She works for herself to earn money, is frugal where appropriate so she can afford expensive, gorgeous clothing, and puts significant effort into her appearance.

Though she puts a lot of value on outward appearances, Mimimi also recognizes inner beauty when she sees it.

She is the 10th girlfriend. She is Rentarou's upperclassman and is obsessed with looking beautiful.

The name "Mimimi" is the word "beautiful" repeated three times, and Utsukushisugi means "extremely beautiful." To English speakers, Mimimi happens to sound like "Me, me, me!" which plays into how she comes across as a vain narcissist.

(Source: 100kanojo Wiki, TV Tropes The100girlfriends, edited)