Hela

Hela was the daughter of Odin and half-sister of Thor an adoptive sister of Loki

History
Hela was her father's Executioner and heir to the Throne of Asgard, even wielding Mjolnir. However, Odin soon realized that blood and violence solved nothing and decided to rule the Realms in peace. He imprisoned his daughter rather than killing her and remarried Frigga, a woman raised by Witches.