Itsuki Koizumi is the mysterious transfer student of North High who turns out to be an esper who was sent by the “Agency” to monitor and observe Haruhi. He is profoundly smiling all throughout the series paired with his rather fairly carefree personality. Kyon hardly plays any major role in the story aside from giving rather wise advice to Kyon. He has the uncanny ability to explore the mysterious “Closed Space” and fight the celestial beings therein whereby saving the world from destruction.