
Quick answer — Takeshi Ooba voices Manabu Sawaki in Space Brothers, Gustav Honda in Fire Force Season 3 Part 2, Kai Shimada in Hakuoki ~Demon of the Fleeting Blossom~.
Takeshi Ooba voices Manabu Sawaki (Space Brothers), Gustav Honda (Fire Force Season 3 Part 2), Kai Shimada (Hakuoki ~Demon of the Fleeting Blossom~).
Manabu Sawaki is voiced in Japanese by Takeshi Ooba.