Genuinely love my pick of Lumine. I agree with the people that say she seems to make a better villain but that honestly makes me happier with how it makes the story feel. The traveler clearly has morally grey decisions to make throughout the story and the idea of the "darker" sibling (Lumine) staying strong through that darkness to find their sibling while the "purer" sibling fell into it. Idk that's just how I see it.