- Voice Actor (CV)
- Daisuke Ono
- Gender
- Male
- Age
- 16-17
- Role
- Supporting
- Identity
- A Kouyouen Academy student who joins the North High Literary Club as Haruhi Suzumiya's devoted companion
Personality
Courteous
Composed
Perceptive
Steadfastly loyal
In this parallel world narrative, Itsuki Koizumi appears as an ordinary high school student, stripped of any supernatural abilities he may have once possessed. Accompanying Haruhi Suzumiya, he becomes a member of the North High Literary Club. No matter how unpredictable or chaotic Haruhi's whims may be, Koizumi maintains his signature calm smile and gentlemanly composure, offering unwavering support from the sidelines. His quiet attentiveness and steadfast presence make him an indispensable supporting figure throughout the story.