I'm considering a TSR game based on a concept I'd been keeping for a while.
I have a concept image to set the theme for the game, I have a rough layout for story and a basic idea of gameplay, how much should I flesh this out to make a thread here?
the point in this being a TSR game is the story in between the plot and major plot twist is guided by TSR characters, so everyone could help with their own plot element or world building, some characters maybe even becoming key parts of the gameplay mechanics.
long story short,
something tragic happens and someone makes a pact with the moon, they get the power to avenge what they've lost but when their done the moon will take their body for its own.
The moon makes the player a darkling, a living shadow, they can shape their body to whatever they have witnessed (bosses you've beaten), you hunt down classic horror monster archetypes like werewolves, scarecrows, skeletons, etc. in beating them you can take their form and use their abilities to aid you. (hence some TSR characters being part of the main character, if pitched with an interesting enough platforming gimmick ofc.)
the ending a typical betrayal, the moon was in on it all along, trapped in the moon it needed a body to return to the world, so it organised your tragedy so you would make the deal, all (or at least most) platforming gimmicks will play part in defeating the moon and trapping it once again in the night sky.
I mainly want to flesh out the world, where horror archetypes fill the world and deities in power of nature itself fill the sky.
I can't fill in the blanks myself, that would be 1 dimensional and boring, but a group project would quickly fill out a diverse and wonderful world, the game then rewarding exploration with a sense of something bigger, and if all goes to plan, a lore worth expanding.