Kōichi Minamoto (皆本 光一 Minamoto Kōichi) is the main male protagonist in the series. He is the commander of a Special Esper team called The Children. He was the first commander that "The Children", Kaoru Akashi, Aoi Nogami and Shiho Sannomiya, liked. I-009 showed him a vision of the future in hopes that he can change it.
Usually seen with a suit and wearing glasses, Minamoto is a fairly tall man with dark hair and light colored skin. He is also considered to be rather handsome.
While good-natured and tolerant for the most part, there are times when he is pushed over his limits and comically displays an enraged Fist of the North Star-esque demeanor, complete with quotes, inspiring fear even on his superiors or The Children themselves. After the timeskip, Minamoto is assigned as supervisor to several other teams who act as support – "The Shadows of the Children", along with "The Explorer" and "The Sleeping Snow White." He also starts developing romantic feelings for Kaoru, although he keeps repressing them out of his obligation to properly guide her and his will to prevent their tragic fate.
- Kōichi is named after Hikaru Genji (光源氏), the protagonist of the The Tale of Genji, who received the surname "Minamoto" upon being stripped of his royal status.
- In one of the initial pilot chapters, Kōichi was a level 7 esper whose ability was the capacity to nullify other espers' powers, similar to Andy Hinomiya in The Unlimited - Hyōbu Kyōsuke.
|Kaoru Akashi | Aoi Nogami | Shiho Sannomiya | Kōichi Minamoto|
|Taizō Kiritsubo | Oboro Kashiwagi | Shūji Sakaki | Fujiko Tsubomi | Ikyūgō|
|The Double Face|
|Natsuko Tokiwa | Hotaru Nowaki|
|Naomi Umegae | Ichirō Tanizaki|
|Hatsune Inugami | Akira Yadorigi|
|The Shadow of The Children|
|Bullet Silver | Tim Toy|