So I’ve seen a lot of fans think about this, and so far, most peoble seem to think it’s either Nathalie, Adrien’s mom, or the newest theory Kagami’s mom. I found a pic of Le Paon and drew around her features. Let’s see:
Reminder that the miraculouss/miraculi can change the person’s appearance (Gabriel has a different facial structure as hawkmoth, and adrian has a working set of cat ears and eyes as chat), so physical appearance wouldn’t have to be exact.
Gabriel’s facial structure changing might be due to the cowl he wears as Hawkmoth making it harder to see his facial traits.
As for Adrien, we can see that his ears are clipped on, making them more like accessories like his costume. As for the eyes, I’ve had a headcanon for a while that Chat’s mask doubles as nightvision goggles and that’s why his eyes get like that. But even if my headcanon is wrong, which it probably is, changing eye colors to match the animal of your miraculous is different from changing your entire bonestructure for no reason