#3 Her dream match is against Charlotte Flair
When answering fan questions (in English), Io Shirai stated explicitly that one of her goals in wrestling is to have a match with Charlotte Flair.
After the barn burner of a match Charlotte just had with Asuka at WrestleMania 34, this would certainly be a welcome contest! There would also be an added element to it in that both women are known for their Moonsaults. While Charlotte's gets more height, Io's is performed more crisply.
This battle between aces, and to determine who the true mistress of the Moonsault is, would be just what the company should want in an era supposedly centered around women's wrestling, and a welcome break from the devolution back into Divas-centered booking we've seen since WrestleMania 33.