
Quick answer — Katsuhito Nomura voices Alfonso San Valiante in Garo: The Animation, Ton in Dorohedoro Season 2, Master in MONSTERS: 103 Mercies Dragon Damnation and 2 more characters.
Katsuhito Nomura voices Alfonso San Valiante (Garo: The Animation), Ton (Dorohedoro Season 2), Master (MONSTERS: 103 Mercies Dragon Damnation), Han-Sung Na (The God of High School), Minamoto no Yorinobu (Garo: Crimson Moon).
Alfonso San Valiante is voiced in Japanese by Katsuhito Nomura.