Norse mythology does not have a devil. Making Loki into a devil is completely wrong. The concept of sin and the devil as twisted evil and instigator of sin is a very Middle Eastern thing, firmly rooted in the religions stemming from that area. In pre-Christian Europe there was no such thing.
So just don’t. Doesn’t matter what you think about Loki. Just don’t.
Cute .gif (and cute Hiddles aside) I’m a bit confused by this line of reasoning.
While Norse mythology doesn’t have a devil, it does have the concept of evil. Not to say that Loki is in fact wholly evil at first. He does some bad things, and some good things. However, as I’m sure someone named sifsdottir knows, that the good pretty much ends with his engineering the death of the truly good Balder (which is also an advent to Ragnarok) by tricking Balder’s blind brother into killing him, and later thwarting all efforts to bring him back to life. If one looks at all that Loki did around Balder’s death, it was seen as twisted, and certainly one might assign it evil. Certainly Norse mythology has him punished for his action, and it being seen as rightly so. Because what he did around Balder’s death was seen as very bad, and worthy of punishment. So maybe Loki started out more Raven and Hermes than Lucifer; more trickster, than evil. But Loki does in fact slide into what was seen as someone truly bad in the context of just Norse mythology, every other myth/religion aside. Within just the context of Norse mythology Loki does in fact cross the moral event horizon at a certain point.
So is Loki purely evil all the time, and the instigator of all evil in the world in Norse mythology? No. Does he end up as seen as evil within the context of Norse mythology? Pretty much, yeah.