Quick answer — Youhei Matsuoka voices Kenji in Tatsuki Fujimoto 17-26, Youdai Matsumoto in WIND BREAKER, Yamashita in Yano-kun's Ordinary Days and 5 more characters.
Youhei Matsuoka voices Kenji (Tatsuki Fujimoto 17-26), Youdai Matsumoto (WIND BREAKER), Yamashita (Yano-kun's Ordinary Days), Furyou E (Loner Life in Another World), Ryousuke Higashida (My Instant Death Ability is Overpowered), Erich (The 8th Son? Are You Kidding Me?), Okada (Ninja Vs. Gokudo), Theobald Wüstemann (Saga of Tanya the Evil Season 2).
Kenji is voiced in Japanese by Youhei Matsuoka.
