Game Concept: You the player are some terrible god-like force and you pick an NPC at random to possess as the Player Character. All NPCs in-game react accordingly to the sudden possession depending on who you pick. You can pick any character with each fresh play through.
Example: You possess the mayor’s son and his family is grateful and humbled to have one of their bloodline chosen as Hero of the Land. If you pick the farmer’s daughter as the PC, her dad will be a game-long companion and come with you trying futilely to help/save his possessed daughter. You pick the town new comer and literally no one will try to help you at all except the farmer’s daughter who, in the play through, is not possessed and is very kind to you.
You still go on and fight the big bad as normal, but 99% of the drama is based around the interpersonal fall out of this small town tolerating you as a a weird spirit thing possessing someone they know in order to save the kingdom.