Gota Araki

Araki Gota Male 26 years old Homeroom teacher of Class 2-C "Now, let's begin the extracurricular lesson." "Don't forget, there are hot fists meant to save someone's heart." Although he is a Silver Kamen Teacher authorized to guide students through legal force, he attempts to understand his students without using violence. At Gakuya Academy, he performs mental care (as Kamen Teacher) under the guise of extracurricular lessons. In doing so, he may use force to deter students, but he never attacks them. Because of this, he clashes with Keigo Kusanagi, the Black Kamen Teacher who condones violence.

Keigo Kusanagi

Kusanagi Keigo Male 17 years old Class 2-C 184cm A cool and mysterious man. He lives alone with his younger brother and works part-time as a host club waiter to earn living expenses. He habitually appears out of nowhere, says something cool-sounding, and leaves. However, behind the scenes, he puts in the painstaking effort of stalking Gota and the M4 to time his entrances perfectly. His true identity is the Black Kamen Teacher, who provides guidance through thorough force. The reason he hates delinquents so much is that they drove his mother, who was a teacher, to her death. Because his philosophy contradicts Gota's, the Silver Kamen Teacher, they end up in conflict. He is another Kamen Teacher dispatched to Gakuya Academy. He favors a black mask and a long coat. Unlike the Silver Kamen Teacher, he does not own a motorcycle.

Shishimaru

Male 17 years old Class 2-C One of the M4, known as the "Shadow Man." An intellectual who manipulates others from the shadows. He calls Kinzo "Kin-chan" and they are always together. He once left an orphanage to live with foster parents but was abused there, which caused him to lose trust in everyone except Kinzo.

Kotaro

Surname is Kitagawa Male 2-C One of the M4, known as the "Mad Man." His personality is short-tempered and easy to snap. He uses a group of subordinates called "Mad Max" to start hunting Kamen Teachers. After reform: After the Kamen Teacher's extracurricular lesson, his personality changes to a chivalrous man who values his comrades, and he begins to treat "Mad Max" as true friends.

Ryota

Male 2-C One of the M4, known as the "Ice Man." He never shows any emotion and always acts cool. Due to memories of being abused by his father in childhood, he developed a twisted personality that knows no love. He became independent from facility life and started "adult hunting" to earn living expenses. After reform: Through the Black Kamen Teacher's punishment, the trauma of the violence he received from his father resurfaces. He is nearly targeted for revenge by the thugs he once mugged, but he learns human warmth through Gota's actions.

Kinzo

Takehara Kinzo Male 2-C The strongest man at Gakuya Academy and the leader of M4. A man of few words, he shows blatant hostility toward Gota, who intrudes into others' hearts. He has been with Shishimaru since their orphanage days and trusts only him. He was saved by the Silver Kamen Teacher when he was framed for safe-cracking at his part-time job, and while he hasn't completely opened his heart, his personality has become a bit calmer. Later, understanding Gota's feelings for his students, he developed a dream of becoming a Kamen Teacher himself.