Yes the demon sword changed her hair and eyes when it possessed her. I think she said that during her first encounter with him?
He knows it’s her
Yes you're right ..it's because of her "soul" ( the purple fire in her ) right ? In the novel that's what i thought...courtesy of his eyes of truth and he really feel guilty because of why she was chosen ( speak of family . ..urgh want to kill them)...
No. He knows it's her. From before I think he already might liked her because he can see her soul. Then maybe when he faced her he knows as well she's her because he can still see her soul. He knew even if she murders a lot of people, she's currently sufferring from the inside.
Ok from what I’m understanding, he remembers his past life but doesn’t know it was her??