Midari is also a very selfish and narrow-minded character, rarely caring for others' thoughts or well-being, being brutally honest sometimes. She even enjoys a game with Erimi Mushibami (one of the members from The Hundred Devouring Families) in which the risk is losing your finger, but turns out to be disappointed when the risk disappears. Midari excited to cut a thread of the guillotine Due to the fact that no one wants to play sadistic games with her, she is desperate to gamble with anyone and constantly awaits to 'get off', as stated in a chapter of the manga, by creating dangerous games where one player ends up dead. She is also very impulsive and has little self-restraint, causing her to look more at immediate satisfaction than any long-term consequences. She is shown to be very persistent and overbearing, intimidating or being weird to the other students, such as when playing a sadistic game of life or death with Yumeko Jabami.

Midari is a character with masochistic and suicidal tendencies, which is stated obviously in one of the chapters in the manga in which she stabs her own eye with an ink pen out to pay off the debt to the president. She is also shown to have two piercings under her mouth, on the left side, one piercing on either ear and a tongue piercing. She has bandages wrapped on either forearm and wears a white medical eyepatch over her left eye. She forgoes the black tie and has on accessories such as a purple hairband with a heart-patterned bow attached, and purple wrist cuffs with stripes on either one. She also sports purple lipstick and has purple painted fingernails. She wears the academy's footwear, brown-colored loafers with black soles.

She wears a rarely seen variation of the Hyakkaou Private Academy uniform a sweater vest in the same colors as the school's black and red blazer, a white button-up dress shirt and a dark pleated skirt, and black socks. In the anime, close-up shots of her eye indicate her eye color to be yellow-green (she has purple eyes in the manga). Midari is pale skinned girl with short black hair that is styled in a concave-cut and extremely tiny pupil(s).

Kakegurui episode 3 caption