Honestly, I've only beaten Persona 5. Put some time in P3 though. Additionally, I've only seen season 1 of MLP so I wasn't sure if a better character than Discord could be utilized. In general, one thing I was thinking for overall story progression is there is some subtle influence giving the player this bimbo power, and the unique thing about the player is they affect the world little by little. Whereas someone else has some other fantasy, perhaps not bimbo related, that affects everyone in the school all at once. Every month the player would have to deal with one day like this, confront the person who created it, and talk them out of it.
this is just one idea, mind you, but it does seem a fun way to work in lots of little things (like scitwi, jungle amazon hierarchy, maybe some kind of sports thing or maid deal)
Another thing I was thinking was the ending of the game, which could effected by how many s-links you've completed:
Mostly Bimbo S-Links - The player is incredibly selfish, but not necessarily hostile. He has created a world of happy, simple-minded sluts who live for him but also each other. A utopia, depending on how you look at it, where everyone is too dim and horny to feel bad about anything.
Even number of bimbo/non-bimbo s-links, or no s-links, or not very many s-links - The player is selfish, but also selfless. He cares only for himself, but not enough to demand society change for him. He can keep whatever sluts he has made, while everyone else forgets he ever existed, as he exists in his own personal isolated hedonistic paradise.
Mostly non-bimbo s-links - The player is incredibly selfless, but not necessarily altruistic. He has a created a world of happy, successful women, who live for each other, but also are deeply indebted to him. A utopia from his perspective, as he will have friends in high places no matter what career he pursues.
IF WE'RE DOING A PERSONA THING - I would view this as a commentary on how we view society and friendship as 'morally good' when they're just as much tools for survival as everything else we do, and how we're all kind selfish, but as long as we're selfish together, it's ultimately for the greater good of us all.
but since we're making a pornographic transformation games about busty sluts, i don't care if that subtext gets cut