
Quick answer — Jin Ogasawara voices Seiji Mukai in TOO CUTE CRISIS, Solon in DARK MOON: THE BLOOD ALTAR, Shou Akitsuki in WAVE!! Surfing Yappe!! and 5 more characters.
Jin Ogasawara voices Seiji Mukai (TOO CUTE CRISIS), Solon (DARK MOON: THE BLOOD ALTAR), Shou Akitsuki (WAVE!! Surfing Yappe!!), Awaki (SSSS.DYNAZENON), Dios Westwood (May I Ask for One Final Thing?), Kai Kusano (Solo Camping for Two), Hayato Momose (Kirio Fan Club), Linus Radiants (ROLL OVER AND DIE: I Will Fight for an Ordinary Life with My Love and Cursed Sword!).
Seiji Mukai is voiced in Japanese by Jin Ogasawara.