
Quick answer — Ikkyuu Juku voices Reinhart in PLUTO, Bartender in Wolf's Rain, Landau in Pokémon Horizons: The Series and 5 more characters.
Ikkyuu Juku voices Reinhart (PLUTO), Bartender (Wolf's Rain), Landau (Pokémon Horizons: The Series), Tenchou (Tonari no Seki-kun: The Master of Killing Time), Ad Jii-san (Berserk of Gluttony), Ryuuzan Arai (Tokyo Majin Season 2), Gale (Fractale), Aldarake Kokuo (Peach Boy Riverside).
Reinhart is voiced in Japanese by Ikkyuu Juku.