Alright, let me see what ideas I can come up with then...
Appearance:
Wears several pieces of jewelry, the most ornate being a face-framing headpiece (her "crown") and a complex necklace, contrasting comparatively simple bracelets around her wrists and ankles. All are actually enchanted in various practical ways.
Considering maybe making her rather dark skinned compared to the more fair-skinned humans around her, but that idea feels a little wonky to me...
Actually, coloration in general is something I want to discuss.
Wings and fur are kept immaculately groomed. Constant groomers tend to her with various aromatic oils and perfumes, giving her a noticeably sweet scent. The precise aroma changes with her mood and other circumstances.
Talent:
Omniglot - centuries of practice means she speaks, reads and even writes pretty much every language in existence. In fact, she actively collects "dead" languages, making her the ultimate authority in that field for some.
Near-eidetic memory, which she gets quite a lot of use out of. If only for to keep the names of her fairly sizable family straight by this point.
Actually a really good cook; she certainly enjoys hiring good chefs to cater to her, but she can prepare some pretty amazing meals herself. Does tend to be a little focused on meats and sweets, though.
Mannerisms:
Motherly, for the most part, with a slight propensity towards well-meaning overbearingness. She's been ruling over a kingdom (and her own impressively sized family) for so long, so it kind of bleeds into how she interacts with them. Think the loving mother who, nonetheless, can't resist saying "Now, are you sure you got everything?" at the last minute before you go on a trip.
Additionally/alternatively, there's the idea she's big on the "help thyself" approach. She will help you, but she doesn't want to encourage you to hold her hand all the time. You need to learn to stand on your own two feet (as it were).