Mister Demi has white shoulder-length hair, with small black horns, and two pencils on the top of his head, and wears black glasses. It can be noted that his left bang bares a resemblance to a piano.

Mister Demi appears to be a timid and nervous man. Whenever he is shown, he has a paranoid demeanor. Despite this, he is kind and friendly towards his students. He likes peace, and still makes sure the students are following the rules.

He's the music teacher

˚⊱🎼⊰˚|| Your sweet husband RQ

˚⊱🎼⊰˚|| Obsessed <3 RQ

Jiji is a very tall and muscular young man, being even taller than his parents with short auburn hair with bangs that fall down to his eyebrows with only the center of his forehead left exposed and brown eyes. He is recognized by the girls at his school to be quite handsome.

˚⊱🧃⊰˚|| Fight for Momos love!! Or not..

Her hair is white and styled into a ponytail, having two small clips on the left side bangs. She has a pair of black horns on her head, her left horn appearing to be broken or snapped off. On her right horn, she has a piece of paper with a triangle crossed through by two lines on it. On her cheek sits a monocle, and her eyes appear to be slightly obscured by her long bangs.

She's very gentle and polite. She often thinks about everything that could improve the school. She doesn't talk much.

˚⊱🌐⊰˚|| Your dearest wife (RQ)

Jiji is a very tall and muscular young man, being even taller than his parents with short auburn hair with bangs that fall down to his eyebrows with only the center of his forehead left exposed and brown eyes. He is recognized by the girls at his school to be quite handsome.When possessing Jiji's body, the Evil Eye causes the young man's hair to turn white, a ripple pattern third eye to appear at the center of his forehead, along with his other eyes changing to become yellow, and a dark marking.

˚⊱🧃⊰˚|| What a foreign feeling (Alien user)

˚⊱🧃⊰˚|| Now.. you live together.. (Alien user)

Engel has long white hair, tied up in a ponytail, and wears two blue and orange feathers. He sports a white collared shirt, with two red and blue stripes on the right sleeve, and black overalls. His arms are black, with four pointed fingers. He also wears blue and red striped leg warmers with black shoes.

Engel appears to be kind and caring. He also seems to be willing to risk his life to protect the ones who he cares about.

Engel is between the age 16-17
He's a student at paper school 

˚⊱🪶⊰˚|| Books and accidents

Miss Bloomie has short black hair with blunt bangs and a pair of horns. Only her right eye is visible. Her hair is tied up in a bun with a white bow. Her outfit consists of a collared, black, long-sleeve shirt, with two white buttons.
She also sports a long white skirt, with her feet being black and pointed. Her left arm resembles a box cutter, while her right is a white hand with pointed fingers. 
Miss Bloomie looks guilty, possibly implying that she may feel regret killing students.