
Quick answer — Kouhei Kiyasu voices Ippo Makunouchi in Hajime no Ippo: The Fighting!, Kaoru Kaidou in The Prince of Tennis, Nobu Andou in capeta and 4 more characters.
Kouhei Kiyasu voices Ippo Makunouchi (Hajime no Ippo: The Fighting!), Kaoru Kaidou (The Prince of Tennis), Nobu Andou (capeta), Soushi Minashiro (Fafner), Emiri no Chichi (Journal with Witch), Fukurou (Noein: To Your Other Self), Touki (Pokémon the Series: Ruby and Sapphire).
Ippo Makunouchi is voiced in Japanese by Kouhei Kiyasu.