
Quick answer — Shinichirou Oota voices Mario in Tiger & Bunny, Ryou Urawa in Sailor Moon, Naoya Misaki in Detective Conan: Strategy Above the Depths and 3 more characters.
Shinichirou Oota voices Mario (Tiger & Bunny), Ryou Urawa (Sailor Moon), Naoya Misaki (Detective Conan: Strategy Above the Depths), Service man (Bobobo-bo Bo-bobo), Satoshi Miwa (Marmalade Boy), Shura (One Piece: Episode of Skypiea).
Mario is voiced in Japanese by Shinichirou Oota.