Sorry if I was not clear - we do *not* want to cast Fëanor as a villain - he's a tragic fallen hero. It's just that he does fall pretty far, so casting someone who has only had 'good guy' roles might not look right for the Season 3 material (Kinslaying, Ship Burning, Death-by-Balrog). Likewise, casting someone who routinely plays straight villain roles would be problematic. Flawed hero or sympathetic villain would be the types of roles to look at, or for actors who play both heroes and villains.
My comment about Redmayne was that, well, yes, he *has* played a villain, but...would you hire him to play a villain again based on that?