The Umbran witches make a big hullabaloo about 'destroying the balance between dark and light' and treat her like some demi-human destroyer of the universe...but I didn't really see any sign of her being influenced by her mixed heritage, with the possible exception of the white hair in the final summoning, and even then Jeanne has white hair in her magic so...did I miss something or was it just a form of Fantastic Racism?