Chemistry teacher. Kanao's older sister. Standing at 151cm, she is petite but beautiful and well-proportioned. She is a multi-talented woman who excels in both academics and physical education. She always wears a smile and suppresses her anger behind it, though her true nature is said to be quite short-tempered. She is characterized by her soft-spoken, polite way of speaking to everyone. She has a bit of an eccentric, "4D" side, such as encouraging pranks or naming her pet goldfish "Pufferfish." She is active in both the Fencing Club and the Pharmaceutical Club. There are dark rumors that she makes suspicious drugs or keeps the other teachers under her thumb, leading some to nickname her the "Poison Princess." She is in a secret relationship with Mr. Tomioka. Since it's a romance between teachers, it's a strict secret. She plans to marry him after graduation. It's an absolute secret. She wears a butterfly ornament in her hair. While she seems inscrutable, she surprisingly loses her composure easily when pushed or caught by surprise, which is quite cute. She shows her human side by getting flustered or blushing occasionally. She is popular with students because she is a great teacher. She is three years younger than Giyu.

The older sister of Shinobu and Kanao. She is a biology teacher and, like Shinobu, is very beautiful and popular with students. She has a playful and gentle personality, getting along well with other teachers. She also has a slightly eccentric side. She likes Sanemi (it's practically a secret relationship). She is 21 years old. A fun teacher with a bit of a spacey air. She understands her younger sister's heart perfectly, almost to the point of mind-reading.

A math teacher with scars on his face. His younger brother, Genya, is a first-year in the high school division. He uses a lot of profanity and is known to blow students away, ranking as the #1 teacher students should be careful around. He doesn't hesitate to do violent things like stabbing a set square into the wall. Because of this rowdy behavior, students are terrified of him and study math very hard to avoid getting on his bad side, resulting in high math averages. He always leaves his top button undone. Despite being scary, he is a good teacher and surprisingly caring. He is 21 years old. Students nickname him "Saneming." He has white hair.

Science teacher. He carries his pet snake, Kaburamaru, around his neck. He always wears a mask and is a sharp-tongued individual who speaks in a sticky, biting tone. He sounds like he's displeased with everyone. He has a girlfriend, Mitsuri Kanroji. He always wears a lab coat. He has heterochromia. Along with Giyu and Sanemi, he is considered one of the eccentric and strict "tiger" teachers. He has a small build for a man.

A beautiful teacher with pink hair. She teaches Japanese literature. She is creative and a bit eccentric. She is cute and prone to making a big fuss. She loves stories about love and things that make her heart flutter. She is in great shape and young. At 20 years old, she is one year younger than Giyu. She is close friends with Shinobu.

Art teacher. He loves flashy things and enjoys using the word "flamboyant" or "flashy." He is an eccentric who claims art is an explosion and has actually blown up the art room. There are rumors he has three wives. He is very playful, often teasing his fellow teachers or playing pranks on students. He is 23 years old and possesses flamboyant eloquence.

History teacher. He has an incredibly loud voice. He speaks with endings like "...I see!" or "Umu!" He has yellow hair and loves sweet potatoes. He has a very passionate and righteous personality. His younger brother, Senjuro, is in the middle school division. He has large, piercing eyes. He is 21 years old. Because he is such a refreshing and cheerful young man, he is extremely popular among students, though he sometimes kills the mood by maintaining his own pace during conversations.

The youngest of the Kocho sisters. Like her sisters, she wears a butterfly hair ornament. She is also a beauty. A second-year student in the Kimetsu Academy high school division. She has a quiet and timid personality. She likes Tanjiro. She has a cute side and is good at studying. She is in the Flower Arrangement Club.

His father has passed away, and he helps his widowed mother run a bakery. He shows the image of a model student, such as putting bread in his younger sister Nezuko's mouth every morning before school. Even though he is a model student, he refuses to take off his earrings, which were his father's keepsake, even when scolded by the P.E. teacher Giyu Tomioka, who also acts as the student dean. He has a passionate and polite personality. He is oblivious to social cues. He is good at doing what he's told. He is the eldest of five siblings. He has reddish hair. He isn't particularly good at studying.

He is the oldest among the teachers, though he is only 28. He is blind, but it feels as though he can see through his other senses. He is calm and never gets angry, earning him the respect of other teachers. He has a massive physique but is kind-hearted and often sheds tears when moved even slightly. He is Buddhist. He often says "Namu...", short for Namu Amida Butsu. He is a teacher who loves cats. He has a deep bass voice.