Yamakawa

Yamakawa (山川) is a minor character who appears in Shinyaku Toaru Majutsu no Index, a pawn of Mitsuari Ayu posing as an Emergency Aid worker.

Appearance
While disguised as an Emergency Aid worker, Yamakawa wears a white coat.

Mental Out Arc
After the Strobila that had been secretly planted in Shokuhou Misaki's neck was removed, Yamakawa and several other men disguised as Emergency Aid workers were dispatched to replace it. They approached Misaki and told her to come with them, claiming to suspect that she was unstable due to suspicious behavior and that they were going to transport her to a facility inside School Garden for care. Misaki saw through their deception and used her ability to make the men see each other as her, leading them to knock themselves out. She then woke up Yamakawa and questioned him, using her ability to pose as his direct superior. In the process, she learned that the Strobila had no data in it and realized it was actually a decoy to make her doubt her memories. When Misaki asked Yamakawa who she was, hoping to learn who his superior was, a mental 'bomb' was triggered in Yamakawa's brain. After undoing the damage with her ability, Misaki rendered him unconscious.