The villain in FF13 is the most forgettable character in series history. I actually had to go look up who it was.
It’s very much a FF9 Necron sort of situation, with the final boss basically coming out of nowhere and having no plot relevance until minutes before the 12th hour. The closest 13 comes to a Kuja in this analogy would probably be Barthandelus, who is like, basically the pope? But he means so little as a character that plot synopses of the game don’t even mention him.
Honestly, 13-2 Snow makes just as much sense as a visitor villain as anyone. I mean, maybe they could have gone with Jihl Nabaat or Cid Raines, but I don’t remember Jihl fighting at all, she was more of a desk jockey, and Cid… Like I’ll be honest, I forgot he existed until I just combed through the character list trying to remember the Pope guy’s name just now.
Snow DOES sorta play a sort of misguided antagonist at certain points in the sequels, so… I mean there’s kiiiiinda some justification for it?
The short version is that FF13 itself is pretty weak on villains. The FF13 oversaga’s strongest villain would probably be Caius from 13-2, so I’m not sure why they wouldn’t have just picked him if they’re gonna make it be someone from 13-2 anyway, but.