
Quick answer — Kaoru Sasajima voices Ryouta Sawamura in Major S1, Eu Lant in Spice and Wolf: MERCHANT MEETS THE WISE WOLF, Taiyo Akagawa in Level E and 2 more characters.
Kaoru Sasajima voices Ryouta Sawamura (Major S1), Eu Lant (Spice and Wolf: MERCHANT MEETS THE WISE WOLF), Taiyo Akagawa (Level E), Mika Kanda (Gantz: Second Stage), Natsu (Cyclops Shoujo Saipuu).
Ryouta Sawamura is voiced in Japanese by Kaoru Sasajima.