
Quick answer — Manabu Muraji voices Mamoru Sekoma in Medalist, Takuhiko Hayaseura in ID: INVADED, Shuuji Sumimura in Kekkaishi and 2 more characters.
Manabu Muraji voices Mamoru Sekoma (Medalist), Takuhiko Hayaseura (ID: INVADED), Shuuji Sumimura (Kekkaishi), Salman (Fena: Pirate Princess), Loki Helios (Lucifer and the Biscuit Hammer).
Mamoru Sekoma is voiced in Japanese by Manabu Muraji.