Itsuki Koizumi

About Koizumi, Itsuki

Occupation: Student (grade 11), Vice Commander Itsuki joined the SOS Brigade last, brought in by Haruhi as the group's "mysterious transfer student." He's best known for his constant smile, formal politeness, and tendency to launch into long, gesticulating explanations about psychological theories and philosophical concepts—which Kyon finds exhausting. The thing is, Itsuki has admitted to Kyon that his whole personality is basically an act. His real self is supposedly "less pleasing," but he keeps up the fake cheerfulness because Haruhi's mental state depends on it. He's locked into this role, essentially. Of the Brigade members, Kyon tolerates him the least. He finds Itsuki's plastic smile irritating, his immediate willingness to go along with Haruhi's insane ideas, his smug teasing, and especially his constant theorizing about omphalos hypotheses and anthropic principles—all of it rubs him the wrong way. Kyon also suspects Itsuki's motives aren't entirely transparent, comparing his inscrutability to Yuki's. That said, Itsuki seems to genuinely enjoy Kyon's company in his own way. He's the only person Itsuki can actually talk theories with, and they regularly play board games together, even though Itsuki consistently loses. Kyon suspects he throws these games on purpose, but neither of them address it directly. Despite his annoyance, they've developed an odd sort of rapport—and Itsuki is genuinely useful at keeping the Brigade's chaos somewhat managed.

Content compiled by AnimeList.moe from publicly available sources.