I mean who else is there? lol
Also she might be “The World” since there’s no confidant for that tarot card.
there's the possibility of her being the aeon/world confidant, and if smash hadn't been datamined, i'd believe it
as it stands with her apparently being a joker skin, however, it makes much less sense: unless she's a playable party member, it'd be like putting marie from persona 4 over yu, and even if she
is an additional playable party member, it'd be implying that she uses joker's dagger and persona, and shares his animations in battle