
Quick answer — Eiji Itou voices Shigeru Fujiwara in Natsume's Book of Friends Season 1, Professor Yamanobe in Maria Watches Over Us: Printemps, Youkai in Natsume's Book of Friends: Nyanko-sensei & The First Errand.
Eiji Itou voices Shigeru Fujiwara (Natsume's Book of Friends Season 1), Professor Yamanobe (Maria Watches Over Us: Printemps), Youkai (Natsume's Book of Friends: Nyanko-sensei & The First Errand).
Shigeru Fujiwara is voiced in Japanese by Eiji Itou.