Quick answer — Reon Tanie voices Mamekichi Maizuka in A Terrified Teacher at Ghoul School!, Shinji Endo in Please Excuse My Younger Brothers.
Reon Tanie voices Mamekichi Maizuka (A Terrified Teacher at Ghoul School!), Shinji Endo (Please Excuse My Younger Brothers).
Mamekichi Maizuka is voiced in Japanese by Reon Tanie.
