IT IS CONFIRMED THAT CHARLES KLAUSEMEYER VOICES NIGHTMARE, PATRICK SEITZ CONFIRMED IT IN A EMAIL, SCREENSHOT AT THE END OF THE PAGE.
Dear members, recently I've been arguing with Delkura about Nightmare's voice actor in Soulcalibur V. After some investigations, I found that Seitz, on his official facebook page, denies voicing Nightmare. While Delkura found on Wikipedia that he is credited as voicing Nightmare.
Therefore, I am asking you your opinion.
Also, the Japanese voice actor is the same for both Nightmare and Raphael. And it appears that somehow Raphael is Soul Edge's new host. (For those who deny it, it has been proven that they have the same facial structure)