I mean, for now it should be removed, as there is no proof that Eua is the same person as Featherine.
It's not because the characters look similar that they are the same, especially in Ryuukishi's works ...
I have since removed Featherine and replaced her with Eua as there is no proof/confirmation they are the same person (in fact, according to Ryukishi, they are not the same).