@SoulOverCaos The premise was pretty clearly presented as Dani having 'existed' prior to actually existing in this world, and just well, being herself as a childhood friend for years prior, I guess. As for why her autofilled past dani would attract her, probably the whole 'treats them like normal people (well, realistically, acts too distantly, but closer to normal than others do) instead of how most people treat her and also the guys like gods on a pedestal' which just isn't pleasant.
'Normal' and mostly good intentioned, not doing any weird shady stuff behind her back. That seems like in addition to years of presumed autofill would build those foundations, just being a pal for quite a while. Ultimately the way any kind of friendship is born, I guess.
Like, she doesn't have a lot of alternatives, like this new girl she's also been getting attached to, who has a personality similar to Dani's, EG a personality she's apparently attached to (we all have our types, anyways, yeah?) seems to absolutely someone doing weird shady stuff, so sooner or later she'll be gone again, and it's back to her only having Dani and the kings, beggars can't be choosers when most people treat you like idols someone not doing that alone could make you attached.
The real question then is what the heck was Dani's 'autofill existence' like? I guess. I doubt we'll ever know though, presumably it was pretty low key childhood friend hanging out stuff where she still just acted generally how she does.