FemJoker

FemJoker is the Rule 63 compliant gender-swap of Joker. Unlike Kokoro, there is no catchy name for FemJoker, at least one that hasn't caught on in /pg/.

Theories
It is theorized that, in the same vein as Persona 3, FemJoker will be playable in some new version of Persona 5. That would entail changes to the story and confidants to accommodate a female protagonist.

There are also those who clamor for FemJoker, but instead of being the protagonist, wish for her to appear as a full-fledged confidant. Why the Twin Thieves would appear in the same game is also a matter a discussion, but can probably be hand-waved away as a result of Metaverse or cognition trickery.

Having FemJoker as a confidant would also mean she may be a romance option, fulfilling the wishes of twincestfags.

Appearance
Described by anons as "the ultimate semen demon", FemJoker is depicted as being extremely attractive, even though she essentially boils down to "Joker with tits". Of considerable attention is her hair, which ranges from being a copy of male Joker's hairstyle, to a veritable fountain of sex hair. Much like Kokoro, her bust and other physical features are up to the artist's discretion, but are tantalizing nonetheless.