Thor’s nemesis happens to be his oldest friend: his adopted brother and “trickster,” Loki. The conflict between these two stems from brotherhood rivalry to regal jealousy. Specifically, Loki is envious of Thor being in line for the throne of Asgard. As a result, Loki spends much of his time plotting against Thor, and thus, Thor spends much of his time foiling Loki’s twisted schemes for revenge and power.