Actually…. I don’t mind the Persephone and Hades thing Edward Cullen does in midnight sun. But I think it would be a lot better if when he sucks the venom from her, and tastes that first drop of pure blood, he realizes that he is Persephone, bound to Bella by blood and by heart (as he says, vampires never fall out of love). He stays with her for half a year, and then, in New Moon, when Edward leaves Forks, and Bella isn’t allowed to follow, trapped as Hades was, he leaves her for about 6 months as well. Forced to return, though, as he had that Bella’s blood, and is bound to her world forever.
Charlie: "I don't know if she's going to get over it– I'm not sure it's in her nature. She's always been such a constant little thing. She doesn't get past things, doesn't change her mind." So Bella has always been this resistant to change
In twilight, there's the occasional mention of her fidgeting when she's nervous, but in midnight sun, edward notices her stimming so many times. it seems like her usual habits are tapping her toes, playing with her hair and wringing her hands
She tries to mirror those around her & copy their tone, even when she's uncomfortable, because she thinks that's just How You Socialize (telling Eric that she also wants to go to comic con despite her having no idea what it really is, her talking very politely and casually about Edward's hunting habits, etc etc)
Poor motor skills
Horrible at evaluating risks / consequences
When she's feeling overwhelmed and needs sensory input she puts on headphones and listens to the same album on repeat for several hours at max volume
Covers her ears for most of the baseball game
Often unaware of her tone when she's speaking. There are moments in twilight where she's like "'xyz,' I said with as much enthusiasm as I could muster," that, in midnight sun, are changed to "'xyz,' she murmured, sounding unsure even as she said it." (The most hilarious example of this is "Go team!" vs "Go team?" in the baseball scene lol)