Itsuki Koizumi 

Member of Haruhi Suzumiya's SOS Brigade. He has a polite disposition, but is, in fact, an esper who is charged with supervising Haruhi and preventing her wishes from getting too out of hand. He informs Kyon of the phenomenon known as closed space. Additionally, Itsuki notifies Kyon most often of the dangers that Haruhi is capable of.

Itsuki Koizumi: "Kyon, Ms. Suzumiya is rather charming, isn't she?"

Kyon: "..."

Itsuki Koizumi by jokerman15 January 1, 2012