
Quick answer — Ryousuke Higa voices Jirou in Tonari no Yokai-san, Jeong-Ho Kang in Solo Leveling, Shitsuji in Ron Kamonohashi’s Forbidden Deductions Season 2 and 1 more characters.
Ryousuke Higa voices Jirou (Tonari no Yokai-san), Jeong-Ho Kang (Solo Leveling), Shitsuji (Ron Kamonohashi’s Forbidden Deductions Season 2), Leviathan no Kanchou (Leviathan).
Jirou is voiced in Japanese by Ryousuke Higa.