Quick answer — Takayuki Miyamoto voices Tadashi Furuyama in Rising Impact, Gelios in My Isekai Life: I Gained a Second Character Class and Became the Strongest Sage in the World!.
Takayuki Miyamoto voices Tadashi Furuyama (Rising Impact), Gelios (My Isekai Life: I Gained a Second Character Class and Became the Strongest Sage in the World!).
Tadashi Furuyama is voiced in Japanese by Takayuki Miyamoto.
