So my idea is Megumi, Mahito, and The merger, are in mha, and they spread Buddhism to people, everyone in mha is still there,
They represent Kenjaku, tengen, and Sukuna in the Nara and heian periods, only their in the modern era.
Think about it mahito and kenjaku like experimenting and having fun. So mahito would like to see how these ‘quirks’ and cursed energy interact and if they are the same or similar
Tengen and the merger, would preserve humanity, but only for their own amusement, not because they care about humans.
Megumi bathed in the negativity of humans, and seeing Sukuna kills his sister and mentor, especially since all he has are his shikigami, and shrine, says screw the world, I’m just going to do what it want.