Ginga is best known for his work as villains, including Mobile Suit Gundam's Gihren Zabi of "Sieg Zeon!" fame and Fist of the North Star's Souther. He's also currently voicing Commodore Perry (the flaming skull) in Space Dandy.
Hunter x Hunter episode 114, “Divide x and x Conquer" ("Bundan × to × Gosan in Japanese") from January 28th will have been Nagai's final episode in the role. His character also features prominently in Hunter x Hunter: The Last Mission anime movie that opened December 27th.