This section is dedicated to the cast of characters that takes part on the show. Some descriptions may include mentions of mayor plot lines, so there will be SPOILERS. Another thing you have to keep in mind is that, there is a set of characters that are students (which take the main focus) and another that are teachers; I am not going to mention all the characters that make up this last segment, given that there are teachers who have no influence on the plot or relevant appearances.

Granddaughter of the 9th-grade class 'A' teacher, Anatoly Germanovich. Due to illness (or rather, because of her grandfather's overprotectiveness, who fears Anya will repeat the fate of her runaway mother, who gave birth to a daughter prematurely), she studies at home. She spends most of her time there. After her grandfather's stroke, she decides to return to school, despite all her grandmother's persuasion. Upon returning to the school, she becomes a representative of the emo subculture. She likes Ilya a lot, but he pays attention to Olga Budilova. After information about her explicit photos is spread online, she becomes the target of ridicule from other students. Gradually, her relationships with the class become neutral, but she has no friends in the class, except, partly, Vera Akhmametyeva. Anya's conflict with the boys during a trip to Suzdal happened over a broken videotape. Anya meets other emo girls and spends her free time with them. Anya is capricious, strong-willed and careless, but deep down she is a very sensitive person. As a result of the harassment by Budilova and her friends, she completely shuts herself off. In episode 65, she ends up being admitted to a psychiatric hospital (rehabilitation center). In episode 66, she commits suicide after taking a large dose of sleeping pills. The last episode shows her funeral.

A newcomer in 9 "A". A skilled manipulator who creates conflicts and wins them, he loves to verbally bother others while revealing his true character. He is rude and has a good sense of humor. He is good at understanding people. To help with his mother’s cancer surgery, he steals an antique figurine from a disgraced artist and negotiates with a classmate’s father, a doctor, so that the surgery is supposedly considered free. He has a well-established value system and rigid moral principles. His academic performance is low because his behavior is disgusting. He is extremely intolerant of those who, in his view, interfere in his personal life. After his mother’s death, he throws daily parties, has sexual relations with his friend Melania, and becomes uninhibited and rude. He blames his aunt Katya for his mother’s death, constantly being rude to her and insulting her. In the last episode, he says goodbye to his aunt and says that he is not angry with her.

She is the "beauty" of the class but has an extremely vulgar character. More often than others, she mocks Anya Nosova. She likes Lyokha Shutov and tries to win him back from Shishkova. There is an unfavorable situation in her family: her divorced father intends to reclaim his property, where Olga and her mother now live. Some time after the night spent with Shutov, she finds out she is pregnant. But later it is revealed that Budilova only has a hormonal issue, which, however, she does not tell Lyokha about. Olga does not love her father for having abandoned them. But in one of the episodes, he tries to come back, and Olya drives him away. Recently, she has become friends with vocational school students. Together with her friends, she attacks Nosova, which she later regrets a little. She is very childish and irresponsible, even though she lives an adult life.

At first, he was friends with Timur, but then he insulted him and his mother. Subsequently, he publicly humiliates Timur's mother on several occasions, creating conflicting situations. He adheres to nationalist positions. He has a little brother, Fedya. Vadim's father is an alcoholic. In one of the episodes, when a professor asked him if he is a right-wing skinheads, he replied yes. He has an unpleasant character, he loves to make fun of the weak and humiliate them. He is capable of stealing and being cruel. He is spiritually and intellectually underdeveloped, he has an extremely poor vocabulary. In episode 53, he meets a group of skinheads, after which he begins to behave even more aggressively. In episode 55, he tries to beat Timur. The academic performance of Vadya is extremely low. He likes Bagheera, a skin-head girl with whom he had an intimate relationship. In episode 65, he was brutally beaten by skinheads. After that, he says he will continue his studies and quits the skin-head subculture.

Prior to Epifanov's appearance, he was the unofficial leader of the class. He bet that he would have an affair with a the physics teacher Natalya Nikolaevna, but his father was actually having an affair with her. Later, he begins to blackmail his father and, after his parents' separation, tries to reconcile them by all means, even telling his father about his mother's fictional admirer. In episode 53, he was transferred to another school.