Yashiro Souichirou

Being the eldest son of the Yashiro family, Souichirou has been taught how to exorcise Kogori demon since childhood. However,

Spoiler

after the events in the mountain with the red child

he started doubting that he does not have that exorcism power at all. After that, he left Haikyo with regret for a while, but upon hearing that Kogori is coming back to the island, he decided to try again and went back home.
Basically a kind and polite person, but sometimes a little bit boastful. Has the belief of "what will happen, will happen" and a flexible lifestyle, but when it comes to fulfilling his own strong desire, Souichirou would quietly look for an opportunity to strike, without taking any step forward.