Quick answer — Shinnosuke Tokudome voices Wada in Let's Go Karaoke!, Freed Diarmuit in The Ossan Newbie Adventurer, Trained to Death by the Most Powerful Party, Became Invincible, Kurotama in The Cat and the Dragon and 6 more characters.
Shinnosuke Tokudome voices Wada (Let's Go Karaoke!), Freed Diarmuit (The Ossan Newbie Adventurer, Trained to Death by the Most Powerful Party, Became Invincible), Kurotama (The Cat and the Dragon), Seri (Kusunoki's Garden of Gods), Feyrith (The Beginning After the End Season 2), Gras (RobiHachi), Tyrone (The Seven Deadly Sins: Grudge of Edinburgh Part 1), Kalkris (Übel Blatt) and 1 more.
Wada is voiced in Japanese by Shinnosuke Tokudome.
