Irina Jelavić

Irina Jelavić is the English teacher for class 3-E of Kunugigaoka Junior High School. She is actually a professional hitman hired by the government to assassinate Korosensei.

Personality
As a hitwoman, she is a really seductive person. Her flawless acting skills allow her to adopt any personality that might benefit her in her mission. This allows her to execute her targets at point blank. As a killer, she's ruthless and always achieves her objective. Her extreme resilience is one of her most dangerous aspects as a hitwoman, since no matter how many times and ways she has to try, she will ensure her target is dead.

Outside of work, she's shown to be a surprisingly normal, even clumsy person. The luxury lifestyle she lives in as a high class hitwoman made her lose touch with the everyday world. At times, her attitude seems even childish and extremely unprofessional, much to the chagrin of Karasuma.

Her true self, however is extremely insecure and unstable. She has little to no trust on people, and seems afraid of her own feelings. Her traumatic memories from childhood never left her, and thus she didn't grow up properly as a person. She had shut off her feelings completely to be able perform her job properly, and became afraid she might not be able to live that life anymore upon realizing how much she cared and truly felt about the students and, especially, about Karasuma. Despite her life experiences and mature appearance she's revealed to be only 20 years old, much to the surprise of her students.

Appearance
Irina is a beautiful, fair skinned young woman. She has long pale blonde hair and blue eyes. With an ample bust and a curvy physique, she has a very seductive body that she utilities to seduce and manipulate her assassination targets in order to achieve her goal. 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, which always leaves her depressed.

History
She is a well known hitwoman by the government. She has a proven track record of 11 jobs in countries all around the world. When she was 12, her parents were killed in an ethnic war in her country. After killing the militarist who murdered her parents, she wandered in the ruins of her hometown until she was found by Olga. She and Lovro took her in and raised her to become a hitwoman.

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 her missions put her through.

Planning: After her seduction techniques, this is considered to be one of her greatest talents. She elaborates detailed plans completely on her own, with backups for any complication that might arise, thus giving her target no chance of survival.

Linguistics: Irina is extremely skilled in conversational abilities, being fluent in 10 different 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 considerable expertise when handling weapons such as firearms and melee weapons. She's also shown her abilities when setting up complex trigger traps when attempting to kill Korosensei. She is shown to be skilled in martial arts, but is still under-skilled compared to more prominent assassins in the series such as Karasuma.

Other abilities: Irina has been shown to be able to play the piano at a concert-performer level with ease while still being able to draw people's attention through minuscule body movements. She is also an expert negotiator.

Korosensei
Koro-sensei is her target. Most of the time, Irina tries to attack Korosensei, who easily evades her attacks. They seem to have a friendly relationship, even with Korosensei constantly making fun of her assassinations attempts on him, and, especially, her love life.

Tadaomi Karasuma
At first, Irina had little interest in him and found him a pain to deal with. Their relationship also started off on the wrong foot as her failed attempt in ending Korosensei's life and lack of interest in teaching the students nearly led to her early dismissal. However, as time passed, their relationship turned more cordial as Irina took an interest in the students' well-being. Eventually, Irina was revealed to have genuinely fallen in love with Karasuma through her failed attempts at seducing him.

Lovro
Irina was Lovro's disciple and to this day still has the upmost respect for him.

Nagisa Shiota
Initially she takes interest in Nagisa because he is the only one who kept Korosensei weaknesses into his account. However her plan to assassinate Koro-sensei foiled after she underestimate Nagisa's information that was deemed undervalue to her. After she witnesses Nagisa's bloodlust that was considered more dreadful when having a "mock assassination" against Takaoka she began to admit a hidden talent that Nagisa posses.

Quotes

 * (To Class E female students) "A woman's beauty is fleeting. Unlike me, you girls were born into a country which isn't particularly dangerous. Be grateful and use everything you have to make yourself shines as a woman."

Trivia

 * Originally, she demanded Class E to call her "Jelavic-oneesama", instead, Karma called her "Bitch-neesan", along with the rest of the class much to her annoyance. After accepting her as a teacher, the class told her that they couldn't call her by that derogatory name anymore, so they quickly changed it to "Bitch-sensei". Irina hates both of those nicknames equally and prefers to be called "Irina-sensei".
 * Her motto is "Life is nudity, admire it."
 * Her three sizes are B97-W60-H91
 * Irina appears as a Story Mode NPC in the PS3 game J-Stars Victory Vs, along with Nagisa and Karasuma.
 * In the tankobon extras, there is a series called "Bitch-sensei's secret skills" the first one being a skin color manipulation technique through blood flow control, and the second being a tongue dexterity skill, as she shown being able to build a small robot model with it.
 * In the popularity poll of Volume 12, she was ranked 5th.