Imagine Hela got banished from Asgard not for her violent excesses but for pacifism, which Odin considered unworthy of the Asgardian ideal. She’s lived on Midgard for centuries with a modicum of magic that her father considered harmless and the company of her dog, who he shrank into lapdop for convenience.
When Loki tries to take over the realm, she intervenes by non-violent means, hiding his staff. Loki tries to convert her to his cause but she is strangely resilient. She tells him he reminds her of Odin and he is horrified, so they sabotage to Chitauri invasion together. Hela later declines to join the Avengers due to her convictions.