Irina Jelavić is one of the high-ranking teachers amongst Yunibāsaru Junior High School, filling in the role in Language arts.
Irina is a rather basic teacher who, much like the other teachers apart of the main building, looks down on the ranks below her. She is inconsiderate towards the lower classes, though does try to woo them over on multiple occasions. Being experienced as a fem-fatale, Irina knows how to seduce a man into what she desires to. She does have a bit of a temper though, and can get easily set off with little time.
Irina went over to Class 3-E alongside Asano, in order to give Korosensei the main idea behind the Ant system the school followed. Irina was a bit annoyed with Korosensei's behavior towards her, but, kept her temper down due to the principal being there with her during the meeting.