Irina Jelavić,

At first, Irina was shown to be a cruel, calculating and arrogant woman with little regard for the students of Class 3-E (earning her the nickname "Bitch-sensei"). Because of her high hit count and model-like appearance, she is a confident woman, experienced and has been described as giving off a mature, black widow vibe by her students because of such.

Although these are all traits she carries, in actuality once her cover has been completely shattered she is shown to be childish, and has a lack of social understanding. Underneath her confidence is insecurities she has carried with her since childhood and a surprisingly humble person who can be earnest. She is not the type that easily gives up and because of her young age, connects well with her students once she gets past her ego. It is because of these students that she shows a softer side, showing that she is not as hard-edged as she may come off. Irina is a beautiful fair-skinned young woman with wavy hip-length blonde hair that is split in the middle, large light-blue eyes, long legs and a curvy figure that she often utilizes to seduce and manipulate her targets on the job.

She is usually seen wearing high-end brands and fashionable clothing which emphasize her flattering form. This often causes Tadaomi Karasuma (a fellow teacher) to reprimand her for wearing "inappropriate" clothing for a teacher.

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