Sand Dancer
Currently catless
Well, Loki isn't a demon, of course. He's a beloved deity of many. If you wanted to know about a figure in someone's religion, its best to take the word of one in it. If I want to know about Odin, I'll ask @The Hammer . If I want to know about Muhammed, I'd ask @Link . So I wouldn't take Christianity's word on a Norse God.
Careful! Chaos deities can be... well, chaotic. I'm not against you invoking him, but stop and consider... do you really need more chaos in your life? Its one thing when a deity seeks you out, but when you're doing the seeking, research carefully.
You could ask Loki to intervene, but he may or may not do as you ask(or may do something else entirely). I've never worked with Loki myself, but I've heard/read from people who have, and he doesn't seem the type to be easily bossed about.
In my experience, its best to make friends before you make requests.
I can't get the movie characters out of my mind. To me they are the gods, and now I wanna be Asatru.