
Quick answer — Kento Shiraishi voices Seiji in Uglymug, Epicfighter, Katou in Chainsaw Man – The Movie: Reze Arc, Tanaka in The Ramparts of Ice and 6 more characters.
Kento Shiraishi voices Seiji (Uglymug, Epicfighter), Katou (Chainsaw Man – The Movie: Reze Arc), Tanaka (The Ramparts of Ice), Tanaka (MEGALOBOX 2: NOMAD), Lin Zhang (The King's Avatar: For the Glory), Sean Datz (Undead Unluck), Yuuta Kurahashi (A Terrified Teacher at Ghoul School!), Moruda Wakasagi (Wash It All Away) and 1 more.
Seiji is voiced in Japanese by Kento Shiraishi.