Well, the only thing that comes to mind is that she doesn't seem to be able to control her strength when excited, usually leading to darling almost dying.
But that doesn't bother me all that much, I'm a big guy 4 her, much bigger than darling who's a manlet by even nip standards, and I think it would be harder to hurt me, even if she did, I wouldn't mind breaking a few ribs if it was her, and seeing her get all concerned and worried for me would be really cute. Plus that stuff is usually done for comedic stuff and lamias in that manga are shown to normally have great control over their snake bits so I don't think it would be too big of a problem.
My favorite thing is how devoted and loyal she is, she has her faults, but she's trying hard to turn herself into the best wife she can be for her darling.
I just want to give her the life she wants and deserves and provide for her while she works hard at being a housewife.
And then I want to come home at night and hug her and kiss her and eat her love filled meal that she spent all afternoon trying to get right