
Quick answer — Motoki Takagi voices Renji Asou in ef ~ A Tale of Memories, Raki in Claymore, Nozomu Futami in Futakoi and 11 more characters.
Motoki Takagi voices Renji Asou (ef ~ A Tale of Memories), Raki (Claymore), Nozomu Futami (Futakoi), Tooru Hoshina (Star Blazers: Space Battleship Yamato 2199), Jonah Matsuka (Toward the Terra (TV)), Masayuki Hazawa (Birdy the Mighty: Decode), Hong Kong (Hetalia: The World Twinkle), Mori Arty (Detective Opera Milky Holmes) and 6 more.
Renji Asou is voiced in Japanese by Motoki Takagi.