Nemuri Kayama

Midnight, the 18+ only Heroine (18禁ヒーローミッドナイト, Jū-hachi-kin Hīrō Middonaito) is a Pro hero and staff at Yuuei. She was the Chief Referee of the Sports Festival for year 1.

Appearance
Midnight is a very beautiful woman, with long spiky hair.

Her hero costume is very similar to one of a dominatrix, she has an eye masked, has half a handcuffs on each wrists, a utility belt around her hips, leather high heels with transparent stockings, the most unique part of the costume is that her "shirt", as it had a leather like tie that is connected to shirt that only covers below the breast down leaving most of above her torso and arms exposed, but without leaving any of her privates exposed. It's not explain how or why that is though.

Personality
Midnight has a very flirty personality, but she also has the tendency to make angry outbursts when someone else interrupts her or when they don't let her finished what she's about to explain.

Ultimate Space & Jams Arc
Midnight appeared along with the other Pro heroes when Class 1-A was attacked by the Villain Alliance.

Sports Festival Arc
At the beginning she tells everyone to play fair during the Sports Festival. The students question her "+18 only" tagline, and ask whether it is fine due to them being in high school. She yells at them and tells them to be silent. She then calls Katsuki Bakugou, the player representative for the Freshman up to the stage. Midnight is then seen explaining the rules of the Human Cavalry Battle and suggested to go for the one that took first place.