You know what I like about Hela?
She’s a straight-up villainous character who isn’t “crazy” at all.
And I mean that both in the real sense of having mental dysfunctions and in the Hollywood sense of “evil, but irrational and senseless about it.”
Everything Hela is and does makes perfect sense for her and for the world she was raised in. She was born into a bloodthirsty society and was raised to be Daddy’s little warmonger. She was Odin’s executioner and she helped him conquer and destroy and empire-build. And when the day came when Odin decided he’d had enough blood and wanted to stop, Hela shrugged her shoulders and said, “Nah, I’m good as I am.”
That she then raised her banner against Odin when he tried to suppress her should really have come as no surprise to Odin or anyone. Hela is exactly what he raised her to be, and nothing about her is irrational or senseless any way. It’s merely that her priorities and values – all perfectly internally consistent – happen to be utterly inimical to our heroes, the civilians of Asgard, and the rest of the universe.