i thought about this aswell, i think they might even focus on young adult characters working in the place of school, or maybe college. and perhaps their various jobs tie to people with palaces. i think sae nijima seemed like she would be a persona user, if they had characters like her it would work, she could even be a potential character. but at the same time i do like the feel of the protag's being high schoolers it worked well. tough to say what would be best i have faith in the game developers, P5 is a masterpiece