
Quick answer — Daichi Endou voices Koutei in The Apothecary Diaries, Satoru Kakuta in THE FIRST SLAM DUNK, Yuris Chichi in Violet Evergarden: the Movie and 13 more characters.
Daichi Endou voices Koutei (The Apothecary Diaries), Satoru Kakuta (THE FIRST SLAM DUNK), Yuris Chichi (Violet Evergarden: the Movie), Kingbo (Ranking of Kings), Jin Bubaigawara (My Hero Academia Season 3), Steve Kido (Ya Boy Kongming!), Mikasa no Chichi (Attack on Titan: Lost Girls), Nine Barthes (Gundam Build Fighters) and 8 more.
Koutei is voiced in Japanese by Daichi Endou.