Originally Posted by Mjölnir
I agree regarding Malekith's voice. There's a nice dynamic to having a cold and frightening look but sound pretty normal. The normal and calm voice in itself says something about how much of a threat he is since he doesn't need to overdo it by shouting or anything like that. He's in full control and you're not going to like what's coming.
Couldn't have said it better.
I like it. He doesn't sound evil, he doesn't sound psychotic. He just looks scary, powerful, and sounds completely collected in what he is trying to do.
It's less about an image, and more about accomplishing a goal.