Yi had a wife who resembled Ten, and a daughter around Ten's age. He seemed to have been with the Hi Shin Unit since it was a 300 man unit.
Yi was a member of the Hi Shin Unit. He helped Ten move her equipment in and out of her tent when she first became a part of the Hi Shin Unit. He told Ten that after seeing Kyou Kai that it didn't matter if she was a man or a woman. While moving boxes he told Ten that she somewhat resembled his wife in her younger days. That she is around his daughter's age, and that she was cute. But must of all to keep trying. Yi was later seen after the battle, dead from a slash to his torso. While looking back at the battlefield, Ten saw his body and his death served as a source of motivation to make sure her strategies were as perfect as possible as she wanted to lose as few people as possible (even more so if they were her acquaintances).
- Yi is the only known character in the anime who doesn't appear in the manga.