Overcome the Past ▪ ▫ The Shinkai Hayato fanlisting

Shinkai generally has a very laid-back and placid personality. He shown to be very caring; when he ran over a rabbit with his bike, he deeply regretted his actions decided to raise the rabbit's baby (Usakichi). This event also traumatized him badly, so he didn't want to participate in races anymore because he felt his obsession with winning was dangerous. Shinkai rejected the offer to participate in the Inter High as a second year, and only returned in his third year because of the support of his teammates. He enjoys food, as seen by the fact that he is often seen carrying power bars around.

When biking, Shinkai can be very quiet and doesn't stand out much. However, when facing off with other cyclists, he becomes a serious competitor. In the past, before the accident that scarred him, he was called the "the straight-line demon" when his determination to win became particularly strong. In this state of mind, Shinkai becomes almost manic in his attempt to win, living up to the "demon" part of his nickname. This side of him resurfaced on the second day of the Inter High when he competed with Midousuji Akira. Shinkai resorted to using this other side of him in order to overcome his trauma that prevented him from passing on the left side. His actions illustrate his desire to live up to the expectations of the team that cares for and supports him.

from Wikia