Same here - FB ought to be something I despise, but I love it. Each character has their own darkness, and there's always the blackness of the curse and Akira underscoring everything they say, think, or do. And the characters are also rebelling against that, with Tohru as the catalyst for it. I think they probably get along with her because they see her darkness and exploit the hell out of her for housekeeping duties but that's another issue entirely and how she handles it. Which isn't the healthiest of ways, because of the extent to which she takes it, but it's better than the ways they've been handling it.