Loki was once married while on Asgard, to a girl named Ash. She was a siren, yes the mythical being that is in the ocean, but she has a human form that's beautiful. Loki fell in love with her, he would hide for her

Loki was married to her since he was a lot younger, he is the god of mischief and he's also a bad guy. Now he's an Avenger with his brother Thor, but Thor knows Ash is alive

Thor calls Ash for help for a mission, but Loki is on the team and only sees her after the mission