
Quick answer — Shinichirou Kamio voices Rio Mason Busujima in HYPNOSISMIC -Division Rap Battle- Rhyme Anima, Makoto Katai in Komi Can't Communicate Part 2, Reynold Stingheart in Undead Murder Farce and 14 more characters.
Shinichirou Kamio voices Rio Mason Busujima (HYPNOSISMIC -Division Rap Battle- Rhyme Anima), Makoto Katai (Komi Can't Communicate Part 2), Reynold Stingheart (Undead Murder Farce), Koigakubo (Blue Period), Kyoushi (Dark Gathering), Wenqing Han (The King's Avatar), Ruck (I'm the Villainess, So I'm Taming the Final Boss), John K. (Pop Team Epic) and 9 more.
Rio Mason Busujima is voiced in Japanese by Shinichirou Kamio.