I still don't know who that is supposed to be.

Ektgt said:

I still don't know who that is supposed to be.

As of Mirror Stage's EN release, I believe this character is Lady Grey.

baconmeh2 said:

As of Mirror Stage's EN release, I believe this character is Lady Grey.

I don't think so since Lady Grey doesn't wear glasses during the game. It's more likely that's her assistant, Nele, who does wear glasses and the girl drawn in this picture almost looks like her.