
Quick answer — Wataru Katou voices Reno Ichikawa in Kaiju No. 8, Rentarou Aijou in The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You, Julius Von Pallistan in May I Ask for One Final Thing? and 11 more characters.
Wataru Katou voices Reno Ichikawa (Kaiju No. 8), Rentarou Aijou (The 100 Girlfriends Who Really, Really, Really, Really, REALLY Love You), Julius Von Pallistan (May I Ask for One Final Thing?), Touka Scott (The Legendary Hero is Dead!), Kail Mursili (Red River), Kabru (Delicious in Dungeon), Shuuji Taira (You and I Are Polar Opposites), Jun Asari-Marchs (Aoashi) and 6 more.
Reno Ichikawa is voiced in Japanese by Wataru Katou.