Smash Ultimate data mining found references to a "Jane" skin for Joker, that also has references to a Pony tail with special physics similar to what characters like Robin and Korrin have. So it might still be a FEMC. She could just be lying in her assesment to keep her secret. I guess we will know on April 24.
My guess,;the new female character is a new character ala Marie. Her line, according to what I've read, is one of disapproval towards the Phantom Thieves.
"Atlus....fighting game."
They don't know what they're getting themselves into. The FGC has to be the 2nd most negative (the 1st one being NMA) community.
"This character's high punch button is too good!!!"
"This attack is 2 frames too long!!!!"
"Why is my favorite char never in Top 8s!!!??? Need buff!!!1!"
"Fucking cheap 1 button antiAir on this character!!!!!!"