I say ironically because I just spent the better part of a year obsessively studying Norse mythology and Viking age Iceland (I've written a number of novella stories related to this) yet it was a comic book movie that reminded me of my love for the God of chaos. Loki though is really an amazingly complex character. He can be good, or evil, God and Jötunn, truth teller, liar, shape-shifter, God of fire and all around plotter and schemer. He is my favorite kind of character.
Another of my favorite illustrators, John Bauer, did an rendering of one of my favorite myths involving Loki all be it a rather strange and confusing one.
In this story which is told in a short stanza within the Hyndluljóð
In this story Loki eats a human heart. We aren't quite sure why or who's heart it is although it does seem to be the heart of someone who practiced very powerful magic because eating the heart impregnates Loki. Loki ends up giving birth to an "ogre." Now "ogre" itself is a French word and although very similar creatures appear in many mythologies ogres as large, viscous, people-eating creatures is a central European folktale creation and doesn't actually appear in Norse mythology that I am aware of.
The passage can also be translated thus:
A heart ate Loki,-- | in the embers it lay,
And half-cooked found he | the woman's heart;--
With child from the woman | Lopt soon was,
And thence among men | came the monsters all.
Now between "ogre" and "monsters" I like to think, and other have also put this forward, that Loki gave birth to the first troll-mother, and that is where the Norse trolls come from.
It makes sense within the realm of Norse mythology and even more sense given the way I have re-imagined trolls in my own work. I can very easily see them as being the children of chaos, fire and very powerful magic. It would still probably horrify Girin though.