The dungeons are ones that specifically take place inside an alternate world, just like in P4.
There are literally two male characters in the cast revealed so far, the rest are all women.
Idol culture was in Persona 2 and Persona 4, and it was such a big draw to P4 they literally made a spin off about it. You don't get to say "It has nothing to do with Persona" when they made an entire game dedicated to it.
They literally said the "Get to know your friends better" mechanic were sidequests where you help them with their problems, which is literally what SLinks are.
They are literally called "Performas."
No, it builds on Fire Emblem archetypes rather than Jungian.