[X] Sixiang the confidant, the friend, the fun older cousin to her other spirits. Things might not be the same, but that was the path she wanted to walk.
While Six is a very fun character who I enjoy the screentime of, I enjoyed that screentime precisely because it was the sort of casual teasing and openness that comes from two close friends. While some people may want to fuck all of their friends, I think that there is a sort of place where you can still be incredibly close with someone and willing to do or face anything, without bringing romance into the equation.
Also: I do think that legitimately we would see less of Six going full nonbinary shifting spirit. Because despite the wants of plenty of chatters back in the sect, Ling Qi is interested romantically in boys, not girls. So when Six is trying to appeal to Qi's tastes romantically, they would take the form of a boy more often. I feel like that's pretty obvious. Hell, it literally happened in this update.