
Quick answer — Naoya Miyase voices Gilbert Blythe in Anne Shirley, Wataru Sajou in The Dreaming Boy is a Realist, Tokuhiko in Journal with Witch and 3 more characters.
Naoya Miyase voices Gilbert Blythe (Anne Shirley), Wataru Sajou (The Dreaming Boy is a Realist), Tokuhiko (Journal with Witch), Eto (The Water Magician), Kosuke Tsunoda (LIAR GAME), Sei Kyougoku (Futsal Boys!!!!!).
Gilbert Blythe is voiced in Japanese by Naoya Miyase.