
Quick answer — Ryou Horikawa voices Reinhard von Lohengramm in Legend of the Galactic Heroes, Vegeta in Dragon Ball Z, Shun in Saint Seiya: Knights of the Zodiac and 14 more characters.
Ryou Horikawa voices Reinhard von Lohengramm (Legend of the Galactic Heroes), Vegeta (Dragon Ball Z), Shun (Saint Seiya: Knights of the Zodiac), Kou Uraki (Mobile Suit Gundam 0083: Stardust Memory), Ladios Sopp (Five Star Stories), Karasu (Yu Yu Hakusho: Ghostfiles), Fujimaki (Mononoke The Movie: Chapter II - The Ashes of Rage), Heiji Hattori (Detective Conan) and 9 more.
Reinhard von Lohengramm is voiced in Japanese by Ryou Horikawa.