Loki

Loki is Jötunn/Asgardian God of Mischief and Prince of Lies, the adopted son of Odin and typically the archenemy of his brother, Thor, as well as the adoptive brother to former Guardian of the Galaxy, Angela. Loki has schemed against Thor and Asgard for ages and his cosmic meddling led to the formation of the Avengers. (1)