Loki.

Odin: But the dia will come when one of you will have to defend that peace.
Young Loki: Do the Frost Giants still live?
Young Thor: When I'm king, I'll hunt the monsters down and slay them all! Just as you did, father.
Odin: A wise king, never seeks out war. But...he must always be ready for it.
[he walks away and the boys run to catch up with him]
Young Thor: I'm ready, father.
Young Loki: So am I!
Odin: Only one of you can ascend to the throne. But both of you were born to be kings!

(In the trailer)
Loki:I will destroy their kind
Thor: You can't kill an entire race
Loki:Then die with them!

Thor: It's...

Loki: In the end, it will be every man for himself...

Loki: How desperate are you that you would call upon such lost creatures to defend you?
Nick Fury: How desperate? You threaten my world with war, you steal a force you can't hope to control and you kill cause its fun. You've made me VERY desperate.
Loki:Ou! It burns you to have come so close. To have the teceract. To have power. Unlimited power. And for what? A warm light for all man kind to share. ANd then to be reminded what real power is.
Nick Fury: Well let me know if real power wants a magazine or something

Loki: You would trade a whole...