
Quick answer — Kouji Seki voices Chikaaki Settsu in The Elusive Samurai, Naijan in Sword Art Online the Movie -Progressive- Scherzo of Deep Night, Tannin Kyoushi in The Quintessential Quintuplets and 4 more characters.
Kouji Seki voices Chikaaki Settsu (The Elusive Samurai), Naijan (Sword Art Online the Movie -Progressive- Scherzo of Deep Night), Tannin Kyoushi (The Quintessential Quintuplets), Rex (May I Ask for One Final Thing?), Greg Zangief (Let This Grieving Soul Retire), Sebas (The Aristocrat’s Otherworldly Adventure: Serving Gods Who Go Too Far), Ashika Ajin (RPG Real Estate).
Chikaaki Settsu is voiced in Japanese by Kouji Seki.