Midnight is a very playful and flirtatious person with a serious andMidnight has no shame for dressing or acting sexually in front of young students and appears to act on whims most of the time. 

When she accepted Mashirao Ojiro and Nirengeki Shoda’s request to resign from the tournament, she commented that their naivety “turned her on”. She was also very excited to see the chivalry displayed by Eijiro Kirishima during the tournament when he shook Tetsutetsu Tetsutetsu’s hand. angry side to her. She gets angry whenever someone interrupts her or when they mention her age and insult her.

When Class 1-A needed to decide on code names for their internship, Midnight displayed her willingness to help her students by making sure they chose names that would represent themselves well. During the Final Exams, Midnight admitted to Minoru Minetathat she has a sadistic side that enjoys dominating others. She can be impressed with those who resort to genius plans, as she was amazed by Minoru using tactical thinking to defeat her by leaving her in place before passing the gate.[2]

Despite her flirtatious personality, Midnight is intelligent perceptive and articulate, seen when she logically explained the reasoning behind some hero's having revealing costumes to make full use of their quirks, and how that lead to "sexy" costumes and how she single handedly instituted the costume regulations, though Mt. Lady replied that it's because she likes dressing way she does. Her love of "youth" is also a reason she gets angry when someone mentions her age or calls her old.