Fain, a changeling. Behind her is her ‘alter ego’/disguise (‘Saffron Shale’) that she wears in public. She had saved the wounded Hardtack and a relationship blossomed. Even when her real form is revealed, Hardtack still accepted her.
This is most likely painfully non-canon, at least as far as the original story goes, due to the lack of changelings at the time. I’ve seen subsequent stories dealing with various versions of the concept. shrugs