Irina Jelavić

Irina Jelavic (イリーナ・イェラビッチ, Irīna Yerabicchi) is the language teacher for class 3-E of Kunugigaoka Junior High School. She is actually a professional hitman hired by the government to assassinate Korosensei.

Appearance
Irina is a beautiful young woman. She has long blonde hair and blue eyes. With an ample bust and a curvy physique, she has a very seductive body that she utilises to seduce and manipulate her assassination targets. Irina is usually seen in fashionable clothing which emphasizes her flattering form though Karasuma regularly reprimands her for wearing "inappropriate" clothing for a teacher, forcing her to change into a more conservative apparel.

History
She is a well known hitman by the government. She has a proven track record of 11 jobs in countries around the world

Abilities
Infiltration: As an infiltration assassin, Irina is considered second to none. She is able to charm her way into her target's inner circles, penetrating the highest security and killing them when they're alone at point-blank range with little difficulty. Irina is seen to be able to adopt different personalities in order to infiltrate into the various situations

Linguistics: Irina is extremely skilled in conversational abilities being able to speak fluently in 10 separate languages. Through these skills combined with her infiltration abilities, Irina is able to extract information from her targets.

Martial Arts Competence/ Weaponry Master: Being an assassin, Irina shows considreable expertise when handling weapons such as guns, knives etc. She's also shown her abilities when setting up complex trigger traps when attempting to kill Korosensei. She shows able skills in martial arts but is still underskilled compared to more prominent assassins in the series such as Karasuma.

Other abilities: Irina is also seen to be able to play piano at a concert-performer level with ease while still being able to draw people's attention through miniscule body movements.

Relationships

 * As we know before, Irina is most talented in her 'seducitve' skill which she used to accomplished her job as a hitmen. So, basically, Irina has lots of relationships with men, in which they're just a part of her mission.
 * With Koro-sensei: Koro-sensei is a target to be killed. Most of the time when they were in a panel box, Irina will endlessly trying to stab Koro-sensei. Well, of course, Koro-sensei always manage to avoid her attacks.
 * With Karasuma Tadaomi: Since the middle of the manga, Irina was showed clinging to Karasuma many times (and trying to seduce him countlessly). Later, it is revealed that she really has a crush on Karasuma. Even she confessed that although she has many experiences and excessive proudness in conquering men, she is confused about his attitude. Class-E and Koro-sensei which know her interest, made a couple set-up for them both. However, Irina didn't told her feelings to him (as it is supposed to be), instead told him a story about her first killing.
 * With Class-E: Their 'bitch'.
 * With Lovro: Irina was Lovro's disciple. However, Irina still can't turn down her master's order until now.