Loki is a Norse God, and also a cunning trickster. He has the ability to change his shape as well as his gender. His adoptive father is the giant Fárbauti, but Loki is included among the Aesir tribe of gods. Loki's ethnicity was jötunn.
Loki is a close companion of the great gods Odin and Thor, both of whom he enjoyed playing the trickster against!
One of the things Loki wishes to do for his portal keepers is to help them with their own trickery, for starters.