>>531017952
Both Istaroth and Naberius had the "she" pronoun in book and item descriptions.
https://genshin-impact.fandom.com/wiki/The_Byakuyakoku_Collection#Vol._2
https://genshin-impact.fandom.com/wiki/Wings_of_Merciful,_Wrathful_Waters
Since Asmoday and Ronova show up in the main quests, so there's no way to mistake them.