There's not a lot to say about Lana either because for most of the series she's just a background character. She has some presence in the last episodes when she's picked to portrait Juliet in the school play and starts dating Goryaev. I think there's a scene when they both have like a serious conversation, but is not translated so I don't have anything more to add.

Ani is a background character, actually I think we never get to hear her say something. The only 'relevant' thing she does is that, in a party held in Vera's house, she dances with Isaev in a 'provocative way' (for the lack of a better word).

I have already told some of his plot line in Budilova and Irina's description, but here it is anyway. He's from 10A and is a pretty bad and violent student. In the firsts episodes he wants to hook up with Budilova and, later on, succeeds but inmediately loses interest in her. Then his attention is redirected to Shishkova and they actually date for a long time. They try to have sex in the school gymnasium while a school event is taking place in the auditorium, but they are caught by the teachers. Shutov and Shishkova's relationship is approved by Shishkova's parent and he asist a family reunion of hers. Finally he loses interest in Irina when he has sex with her. One of the worst characters of the series alogn with Goryaev.

Murzhenko is 9A's new head teacher after Germanovich has a stroke. Her authority is constantly challenged by the students, specially by Epifanov. With the pace of time, she gets along with 9A and eventually becomes the school's director. Again, I have the impression that more was going on, but it wasn't tranlated.

Arseniy is a chemistry teacher, close to Germanovich. He used to teach Anya chemistry back when she was homeschooled. It's pretty evident that he doesn't see Anya as a student, he has a 'romantic interest' (again, for the lack of a better word) in her. He actually tries to help Anya in the midst of her spiraling depression but he does it trough blackmail (remember her nude pictures?). The rest of the teachers know about his attraction to Anya.

Natalia Nikolaevna is a physics teacher. Due to her young age and charismatic character she has a great approach with the students. Some of the teachers are jealous of her (like the english teacher) and other disagree with her teaching method. It's really important the fact that she pursue an affair with Anton Korolev, she even organizes the school trip to spend time with him.