A special teacher in the Chrysanthemum Class. His primary weapon is a hammer. He is a new recruit who joined after Yoshiteru. He initially gained immense favor from Yoshiteru by being the first to call him by his correct name, but he has been deeply hated ever since it was revealed he is Sylvia's ex-boyfriend.

A former legendary assassin known by the nickname 'Witch.' While her combat skills are undeniable, she is a huge sucker for good looks and has a major weakness for handsome men.

A fellow teacher and senior to Rita in the Dandelion Class. Unlike the special teachers who were assassins, he is a handsome, black-haired con artist who used to scam people.

A newcomer to the Dandelion Class. She has blue eyes, black short hair, and wears yellow hairpins. Like Rita, she is a former assassin and the youngest daughter of the famous Bradley assassin family. She is notorious enough that rumors say any path she walks is left in ruins. She is currently dating Natsuki.

A man with blonde hair and black eyes. A former police officer who was arrested for murdering his superior.

Luke's partner. She has a huge secret crush on sexy men, though she tries not to show it... She is currently in love with Luke.

The twin younger brother of the protagonist, Rita. He is a member of the New World Order, the primary enemy of Black Kindergarten, and remains shrouded in mystery.

She has a long ponytail, wears glasses, and has a large scar near her left eye. She appears as Leo's subordinate and partner, and she deeply respects him.

A member of the assassin organization Yatagarasu and the representative of Ueno.

The teacher of the Violet Class and the strongest special teacher within Black Kindergarten.

A teacher in the Violet Class alongside Una Mauri. A mysterious teacher who wears a yellow bear mascot suit.

A person who works as an assassin on the side while running a goldfish shop in Asakusa with his younger brother, Haruo. After the battle with Rita's group, he serves as an office worker and combat support for Black Kindergarten. He is dating Hana.

A child with white hair and yellow eyes who always carries a whistle in her mouth. Although she isn't registered in the kindergarten records, for some reason, Principal Erina dotes on her, and she is always guarded by the strongest special teacher of the Violet Class.

A former teacher of the Chrysanthemum Class at Black Kindergarten who was sent to a re-education facility in Yokohama after causing trouble. He has two-tone orange and black hair and slit pupils. He looks Chinese but is actually a Japanese man. He has a constitution where he falls asleep if he doesn't drink one energy drink every hour. He likes Sylvia and confesses to her constantly, only to be rejected every time.