HP: Loki The Guardian of Harry HP

When Loki fell from the bifrost. He was expecting death and abyss of Oblivion, not to become a spirit and then be ripped apart after that and be to forced into a 6 year old boy named Harry Potter.

Now, with no body and physical appearance of Loki he will and must have to keep the boy alive, and if you want to live and survive you just have to become someone greater than anyone in the world.

And last question why would he want to do that well you have to read the story for that...