A 41-year-old female teacher. Referred to as Miss Circle. A safety instructor who teaches how to increase survival rates. Standing 2.9m tall with white skin, her left arm from the elbow down is a flamethrower. It is detachable and requires regular maintenance and refueling. Three years ago, she used to kill students with poor grades at a normal school, but was imprisoned and later released by the Principal. Currently, her violent tendencies are somewhat suppressed, and she tries to treat students kindly. However, she still strictly scolds those with poor grades. A heavy smoker and a motorcyclist. She wears an orange and red poncho, a black shirt, yellow trousers, black boots, and black gloves. Her hands are stained black from the wrists down, and they are large with pointed fingertips. She wears orange goggles on her head and has spiky, messy black hair that reaches below her knees, with two black horns resembling cat ears. She has jagged teeth and wears an orange muffler. She dislikes the killing of students and often protects them from other teachers. Possessing high intelligence, superhuman strength, speed, and toughness, she is likely the strongest among the faculty. Energetic and cheerful.

A 39-year-old female teacher. Teaches tactics and the improvement of marksmanship skills. In addition to being a shooting instructor, she also works as an assassin. Standing 2m tall with jagged teeth. She has followed the same path as Circle since three years ago. She has black medium-bob hair tied at the back with marking tape that reaches her knees. She has two black horns like cat ears. Her left eye is hidden by her hair. She has white skin, a hazard-symbol hair ornament, and a formal black trench coat with silver buttons. Her legs taper to points at the ends. Her left arm from the elbow down is an AK47 and is capable of firing. It has a magazine and requires reloading. She is cold and ruthless, a fact recognized by both herself and others. She kills students with poor grades. She hunts down her targets like a feline predator. She possesses superhuman strength and agility, mastery of martial arts, and high intelligence. Her right hand is slightly large with pointed fingertips.

A 38-year-old female teacher. Standing 2.4m tall. A mining consultant (also teaches mining and bomb disposal). Teaches how to make destruction and explosions aesthetic. Due to suffering from mental illness and anxiety, she sometimes acts erratically. Because of a hearing impairment, she often speaks loudly. She wears a high-necked, yellow long-sleeved dress and has jagged teeth. She carries an explosives belt and a radar slung over her shoulder. She has a transceiver on her head and explosives wrapped around her head as well. She struggles with emotional control and occasionally yells at students. She likes green tea and the smell of gunpowder, but hates smokers. She scolds students with poor grades. She possesses superhuman speed, high intelligence, and linguistic ability. Her hands are black and enlarged from the wrists down with pointed fingertips. She is the fastest among the faculty. She has white skin. Usually, she is surprisingly kind. She has followed the same path as Circle since three years ago.

The principal of the military academy and a First Sergeant of the battalion.