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.
"Loki by Loki" by Tom Hiddleston :D . If Happy Hiddles doesn't make you happy, then you are beyond the help of mortal men >>> I just want to protect this man and huggle him and keep him safe from corruption. In the least creepy way, of course.