Loki Laufeyson was the Trickster God, God of Mischief, Evil, and Lies, a member of the monstrous Frost Giants of Jotunheim that was adopted and raised among the Asgardians, a group of humanoid beings from the pocket dimension of Asgard, the Realm Eternal. Born smaller than the rest of his race and rejected by his father Laufey, he was adopted by the All-Father; Odin following the war. He was taken back to Asgard to be raised alongside his adopted brother Thor. He was worshiped by the humans known as Vikings and became part of Norse Mythology. Loki grew jealous of his brother after learning his true origin and schemed against him and Asgard. His later cosmic meddling led to the formation of the Avengers, "Earth's Mightiest Heroes".
 
Throughout their childhood and into adolescence, Loki became resentful of how differently he and Thor were treated by the general Asgardian citizenry. Valuing great strength, tenacity, and battle-bravery above all, the Asgardians clearly favored Thor. Loki's gifts, however, lay in other areas, most notably sorcery. Possessing a natural affinity for commanding great magical forces, he schemed to use his power to destroy Thor and become the most powerful in all of Asgard. As the two grew, Loki became increasingly jealous of Thor's high status, and resented the distance that grew between them as their paths in life diverged.