Aikawa has a rather ordinary appearance, with dark brown hair and sporting a grey business suit accompanied by a pair of yellow-tinted glasses and a spotted yellow tie.
Youichi plays a significant role in the passing of the AI naming law. His assassination by Toak in the original timeline leads to outrage by supporters of the AI naming law. This outrage contributes to the passing of the AI naming law, making him a martyr for the cause.
In the revised timeline, Youichi is saved by Diva. His survival leads to the AI naming law being rejected. However, a stronger version of the law is passed.
- Youichi's surname Aikawa means "phase, aspect, countenance, mutually, fellow" (相) (ai) and "river, stream" (川) (kawa).