
Quick answer — Tetsuo Gotou voices Derflinger in The Familiar of Zero, Arvind Lavie in Planetes, Horikawa in Princess Principal and 5 more characters.
Tetsuo Gotou voices Derflinger (The Familiar of Zero), Arvind Lavie (Planetes), Horikawa (Princess Principal), Martin (Squid Girl), Oshou Yakushi (Kuromukuro), Scarron (The Familiar of Zero), Dr. Sonoida (Dinosaur King), Ivica Tanović (Eureka Seven AO).
Derflinger is voiced in Japanese by Tetsuo Gotou.