Itsuki Koizumi
From SOS団 Wiki
Itsuki Koizumi (古泉 一樹, Koizumi Itsuki?) is a main character in The Melancholy of Haruhi Suzumiya (Suzumiya Haruhi no Yuutsu).
Voiced by Ono Daisuke in the original Japanese and Johnny Yong Bosch in the English dubbed version, Itsuki was added to the group for being, in Haruhi's definition, a mysterious transfer student. While he claims that he is not known as an Esper, he calls himself this to make it easier for Kyon to understand. While in comparison to an Esper he has supernatural powers, he can only perform them under certain conditions
A member of a secret organization known simply as "The Organization" (機関, Kikan?) consisting of humans who gained powers three years ago, that has been actively protecting humanity by fighting the Shinjin (神人).
Itsuki was sent to observe and protect Haruhi, as some people in the organization believes that she is God, that she created the universe, and that the universe might be destroyed if anything happens to her.
Itsuki tends to work more towards keeping Haruhi in a good mood, and because of that he does not usually help Kyon stand up against Haruhi's actions.When spoken to by Kyon (or when speaking towards Kyon) he tends to make very long winded and philosophical speeches, which turns out to usually just annoy Kyon and further confuse him.
