Annabelle Gesson fanfic? I'll be real, I haven't kept up with every single one, but the ones I've stumbled on tend to circle a few specific heartaches. There's this heavy undercurrent of 'how to love someone who can't love you back'—not because they're cruel, but because their world, their duty, or their own damage just won't allow it. It's less about dramatic confrontations and more about quiet, devastating moments where a character realizes the gulf between them is permanent.
I remember one story where Annabelle and her counterpart were at a ball, sharing a dance, and the entire emotional weight was in what they didn't say. The description of her hand on his shoulder, the half-inch of space between them charged with everything impossible, hit harder than any declaration. That theme of yearning within strict societal constraints feels very true to the original tone, I think. The most emotional bits aren't the tears, but the forced smiles across a drawing-room.
A less obvious theme I've seen done well is the cost of intelligence for a woman in that era. The frustration of having to play a role, of deliberately dimming your own light to navigate a man's world, and the loneliness that comes from being the smartest person in the room but unable to show it. That specific flavor of isolation gets me every time.