
Quick answer — Hiroki Matsukawa voices Ippon Tsuno no Youkai in Natsume Yuujinchou Go Tokubetsu-hen, Takanobu Aone in Haikyuu!! the Movie: The Winner and the Loser, Knuckle Saturnia in MARRIAGETOXIN and 6 more characters.
Hiroki Matsukawa voices Ippon Tsuno no Youkai (Natsume Yuujinchou Go Tokubetsu-hen), Takanobu Aone (Haikyuu!! the Movie: The Winner and the Loser), Knuckle Saturnia (MARRIAGETOXIN), Chouchou (In/Spectre 2), Lloyd (The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat), Sonchou (Helck), Lottor (In the Land of Leadale), Miya no Oji (Dekin no Mogura: The Earthbound Mole) and 1 more.
Ippon Tsuno no Youkai is voiced in Japanese by Hiroki Matsukawa.