Character profile
Itsuki Koizumi
古泉一樹Biography
Itsuki Koizumi is the last member to join the SOS Brigade, recruited by Haruhi as a mysterious transfer student. He is unfailingly polite, frequently smiling, and fond of offering long speculative explanations to Kyon, with whom he also enjoys playing board games.
Story spoilers
Itsuki is an esper sent by a group called the Agency to observe Haruhi and help keep her emotionally stable. Although Haruhi openly wants to meet an esper, he keeps his true nature hidden from her.
6 credits