Itsuki Koizumi  

In the Disappearance arc, the altered Koizumi reveals that he has a crush on Haruhi. This does not necessarily mean that the real Koizumi harbors such feelings, but it is possible that he would have feelings for her if Kyon would not be Haruhis love interest. Itsuki also reveals that the majority of "The Agency" advocates observing Haruhi instead of doing anything that might provoke her. Despite the theory he advances in which Haruhi is the equivalent of God, Itsuki says that there are many differing lines of speculation about Haruhi within "The Agency." Itsuki himself does not believe in a singular God, nor does he regard Haruhi as such, although he reveals that he has colleagues that do. Apparently, most of the questions that he raises about Haruhis true nature are philosophical in nature and do not necessarily represent his personal beliefs. In the Astonishment arc, Koizumi is revealed to be the leader and founder of the Agency. Furthermore, he reveals part of his true personality when he blows up at the aliens and time travelers for meddling. More or less, he threatens war against both factions should they continuing tampering with Haruhi. Koizumi also says that he is a part of Haruhis subconscious made physical, although he never explains what he means more fully. Despite the theory he advances in which Haruhi is the equivalent of God, Itsuki says that there are many differing lines of speculation about Haruhi within "The Agency." Itsuki himself does not believe in a singular God, nor does he regard Haruhi as such, although he reveals that he has colleagues that do. Apparently, most of the questions that he raises about Haruhi's true nature are philosophical in nature and do not necessarily represent his personal beliefs. In the Astonishment arc, Koizumi is revealed to be the leader and founder of the Agency. Furthermore, he reveals part of his true personality when he blows up at the aliens and time travelers for meddling. More or less, he threatens war against both factions should they continuing tampering with Haruhi. Koizumi also says that he is a part of Haruhi's subconscious made physical, although he never explains what he means more fully. He seems especially suspicious of the time travelers, particularly Asahina (Adult). Itsuki was sent to observe and keep Haruhi emotionally stable, in order to protect the rest of humanity. Although he is an esper, which is exactly one of the sorts of people Haruhi desires to meet, Itsuki never reveals himself as such, at least, not to her. In the Disappearance arc, the altered Koizumi reveals that he has a crush on Haruhi. This does not necessarily mean that the real Koizumi harbors such feelings, but it is possible that he would have feelings for her if Kyon would not be Haruhi's love interest.