Then there are 2 possibilities
Either she won’t mind me having Sayori sit next to Sephiroth (weirdly enough I already told my aunt beforehand that Sephiroth was an antagonist and Sayori wasn’t and she didn’t really question me setting Sayori alongside Sephiroth) or she’s just gonna have them stay far away from each other in case they both plot on destroying the world (yeah ik it was literally 2021 like mfs say literally 1984)
But I’d rather not do that so then my best bet would be depicting Sephiroth alongside Bowser (a iconic villain she’s actually known for a while) and see what she thinks