Power defines Thor's life. The son of a king and wielder of the biggest doorknocker in the whole universe, he gets to use power both directly and indirectly. He finds it decidedly inconvenient when that power is taken away from them, and has to learn how to use it responsibility if he's every going to get it back.
Loki, too, is obsessed with power: mostly power he doesn't have and desperately wants. The irony is that Loki may actually have the makings of a great king and Thor doesn't, something that will need to be rectified before Marvel's famous post-credits cookie shows up.
Power is shown as a tool in this film: like Mjolnir, it's good or evil depending on how it's used.
Power has an inherent good or evil quality to it in Thor.
Loki's consumed by jealousy: of his brother, of his father, of everyone and everything around him. In fact, we could just repeat all of Loki's lines here and have the whole "jealousy" thing covered. And Thor himself gets a bit green-eyed when yearning for Asgard from his exile on Earth.
A lot of the drama in Thor concerns people wanting what others have, and they're defined not just by what they want, but how they resist—or fail to resist—the urge to claim it.
Loki's jealousy sometimes leads him to do good things, even if they're for the wrong reason.
Nope, sorry. Loki is bad to the bone and his jealousy is a big part of it.
Thor's a lot of things, but humble ain't one of them. He has to learn all about it, since that's what keeping him from being a hero instead of a jumped-up frat boy jerk. In many ways, his hero's journey is all about teaching him humility, which he learns at the feet of a couple of plucky scientists who aren't exactly living the high life.
It helps him to be a better person (or god) and to use the power he has wisely instead of just kicking down doors and beating people silly. Humility is the key to growth and change in Thor, and what ultimately defines the title character's difference with Loki. (Besides a whole lot of brains, that is.)
Humility serves as the counterbalance to power.
Humility doesn't affect one's use of power one way or another.
Thor thinks being a hero is all about bashing monsters. It's a lot more complicated than that, as he learns.
Sacrifice for him means giving up everything for the benefit of others. Loki make sacrifices too, though they're more of the knight-takes-pawn types than anything he has to do. Jane and her buddies make sacrifices by pursuing the leads on a scientific phenomenon that no one else believes in. Even Odin has to make sacrifices with his Odinsleep.
If you want to be a player in this game, you got to give…and not because of what it gets you, but just because it feels good.
Sacrifice in the movie only counts if the characters have no alternative gain from it. (Like Loki, for instance.)
Sacrifice matters no matter what the losses and gains are, provided that it's undertaken with a sense of selflessness.
Thor thinks he has this whole good guy thing figured out. Turns out, he doesn't know nearly as much as he thought he did: being a hero means a lot more than smacking monsters in the face.
Loki seems to be a bad guy—what with the lying and all—but turns out his sneakiness serves a greater good, too. They're both consumed with doing the right thing, but that tricky word—"right"—can be a lot more complicated than it first appears. These two brothers have a lot of learning to do…though only one of them ultimately picks up the correct lessons.
Ethics are tricky and subtle according to the film, which is why Thor often struggles with them.
Ethics are very straightforward. Thor just has to figure it out.
Thor is separated from the universe he knew, forced to come down to Earth and root around in the mud (literally as it turns out) like the rest of us humans. Even worse, he has to grapple with what he's lost and accept that he's responsible for that state of affairs, all with no hope of ever returning home.
Oddly enough, Loki ends up in exile just as Thor returns…only he chooses exile voluntarily since he drops into the Giant Cosmic Drain Pipe rather than let Odin and Thor pull him to safety.
Thor's exile is self-imposed in many ways and only when he understands his own limitations that led him here can he grow.
Exile isn't self-imposed, but rather a reflection of the greater community's needs and values. Thor can end it only when he embraces the greater good.