
Quick answer — Ryou Iwasaki voices Shuuichi Iguchi in My Hero Academia Season 7, Watanabe in Harmonie, Ogasawara in Ro-Kyu-Bu ~ Fast Break!.
Ryou Iwasaki voices Shuuichi Iguchi (My Hero Academia Season 7), Watanabe (Harmonie), Ogasawara (Ro-Kyu-Bu ~ Fast Break!).
Shuuichi Iguchi is voiced in Japanese by Ryou Iwasaki.