Soul keeper

A baby girl with a mysterious orange stone in her chest is found by Odin the all father after a battle and taken to Asgard to be saved. Only for Odin to find a secret that could destroy the safety of Asgard and the nine realms. Odin sends the child to an unknown planet where she is found by the guardians of the galaxy who raise the girl as quills sister. The guardians are asked to join the avengers and two brothers from Asgard on earth to help protect it for an alien race sent to destroy it.
As the avengers discover the secret of the girls powers and the brothers reunite with their long lost friend, tensions rise between the tall dark haired and green eyed brother named Loki and the daughter of the most powerful being in the universe.