I think it's kind of silly that like half the cast of an alleged P4 fighter is from P3. They're cool characters and all (would've raged if it was something like the bitchy bow girl, the snotty kid, and the puppy instead of 3 of the 4 good PCs *laughs* ), but just kind of got an "out of place but thrown in because P3 = $$$$" vibe. I can tolerate Aigis because she's awesome, but instead of Aki and Mitsuru, I would've rather seen the main human villain (no spoilers *laughs* ), since at least he's actually from P4.
If it had been Shinji and Chidorita, I could've accepted it (for the same reasons as Aigis *laughs* ), but there are perfectly good P4 characters not being used.