Loki, "Thor: The Dark World" - What's so unsettling is how calm he is. How reserved and determined. You know he's serious and you know you never want to piss someone like Loki off. There is a reason the silent rage is the most feared.
Clark Gregg everyone! I walked into my roommates room tonight to talk to her and she's been watching Agent's of S. and she asked me who my favorite Avenger was, I said Coulson, he's been my favorite since the beginning. Clark Gregg is the best.