Hiroki Takahashi (高橋 広樹, Takahashi Hiroki) is a Japanese actor, voice actor, and singer. His major roles include Eiji Kikumaru in The Prince of Tennis, Tobias in Pokémon, Kenji Harima in School Rumble, Hisoka in Hunter × Hunter (1999), Katsuya Jonouchi in Yu-Gi-Oh! Duel Monsters, and Takato Saijō in Dakaichi. On video games, he voiced Ryu in the Street Fighter series.
Source: “Hiroki Takahashi”, English Wikipedia (CC BY-SA 4.0), excerpt