
Quick answer — Tomohisa Asou voices Beck in Beck: Mongolian Chop Squad, Nako in ONE PIECE: Episode of Nami - Koukaishi no Namida to Nakama no Kizuna, Densuke in Den-noh Coil and 16 more characters.
Tomohisa Asou voices Beck (Beck: Mongolian Chop Squad), Nako (ONE PIECE: Episode of Nami - Koukaishi no Namida to Nakama no Kizuna), Densuke (Den-noh Coil), Nick (Attack on Titan OVA), Roujin Juukeisha (Baki Hanma), Matsugorou Sawamura (Those Snow White Notes), Rocco Belfeban (Lord El-Melloi II's Case Files {Rail Zeppelin} Grace note), Wolfgang (Betrothed to My Sister's Ex) and 11 more.
Beck is voiced in Japanese by Tomohisa Asou.