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Relax! I don't believe in the existence of an Almighty God, or the Ultimate Creator that created humans. Many of my companions think the same way as well. Yet, there's one thing that bothers us.
~ Itsuki Koizumi

Itsuki Koizumi is one of the main protagonists of the light novel and anime series Haruhi Suzumiya. He is a transfer student who reveals himself as an Esper, sent by a group known only as the Organization to watch over Haruhi Suzumiya.

He is voiced by Daisuke Ono in the Japanese version of the anime and Johnny Yong Bosch in the English version.


Itsuki has brown hair, green Nishnomiya school uniform, red tie, his eyes was brown, grey pants & brown shoes. Itsuki was an esper he can use his balls to destroy all the enemies for his own personal self.


Itsuki has a polite manner and likes to go into long lectures and explanations with very expressive hand gestures. He has the tendency to go along with just about anything Haruhi suggests, much to the frustration of Kyon.

Itsuki considers Kyon a trustworthy place to give information, but often invades his personal space. He often seems disappointed by Kyon's nonchalant or irritated attitude. Itsuki has even complained that Kyon's attitude toward him resulted in mockery at "the office". Socially specking, despite Kyon's annoyance of Itsuki, they get along well as Yuki is silent unless asked something, Mikuru is usually acting as a maid or being harassed by Haruhi, and Haruhi just generally doesn't talk much about anything other than club activities.

In the light novels, he's described at being very bad at board games and cards, but in the anime it's Kyon who usually loses to him.


Itsuki claims to be part of an organization that consists of espers who work together to fight off Shinjins and repress Haruhi's creation of closed space. As an esper, he can use psychic, supernatural powers, but generally only in the closed space (beyond being able to sense supernatural phenomena).

In the anime, his powers derive two special attacks, named "Second Raid" and "Fumoffu", names of the two sequels of the Full Metal Panic! series. In the novels, his "attacks" are unnamed.



                    Kyoto Animation Logo.png Heroes
Full Metal Panic!

Sousuke Sagara · Kaname Chidori · Teletha Testarossa · Kurz Weber · Melissa Mao · Andrei Sergeivich Kalinin · Richard Mardukas

The Melancholy of Haruhi Suzumiya

Kyon · Haruhi Suzumiya · Yuki Nagato · Mikuru Asahina · Itsuki Koizumi · S.O.S Brigade


Ayu Tsukimya · Shiori Misaka

Lucky Star

Konata Izumi · Kagami Hiiragi · Tsukasa Hiiragi · Miyuki Takara


Tomoya Okazaki · Nagisa Furukawa · Kyou Fujibayashi


Yui Hirasawa · Ritsu Tainaka · Mio Akiyama · Tsumugi Kotobuki · Azusa Nakano · Ui Hirasawa · Jun Suzuki

Love, Chunibyo & Other Delusions

Rikka Takanashi · Yuuta Togashi · Sanae Dekomori · Shinka Nibutani · Kumin Tsuyuri · Satone Shichimiya

Tamako Market

Tamako Kitashirakawa · Dera Mochimazzi

Amagi Brilliant Park

Seiya Kanie · Isuzu Sento · Latifa Fleuranza

Myriad Colors Phantom World

Haruhiko Ichijo · Ruru · Mai Kawakami · Reina Izumi · Koito Minase · Kurumi Kumamakura

Miss Kobayashi's Dragon Maid

Kobayashi · Riko Saikawa · Shouta Magatsuchi · Makoto Takiya · Tohru · Kanna Kamui · Quetzalcoatl · Fafnir · Elma · Ilulu