An RPG that is already based in weight gain and inflation but has built in modding tools that are simple to use. you want to reskin a preexisting enemy and give them an attack that immediately immobilizes the target? you can.
preferably 3d with full character customization including choice of sex, gender, custom pronouns if yours aren’t included. body type preferences for yourself and your partners. also you can change essentially anything about your character at any time using an item (magic mirror, morph potion, idk). you can be a tall, muscle gutted, green, anthro tiger or a chubby, or regular human if you’re weird.
I like the idea of a semi modern fantasy setting where you can call your wizard friend on a smart phone to help you fight a dragon with necromancy powers and its army of skeletons.
a large party system where you can travel the world with multiple people at the same time.
some sort of property ownership system where you can buy the local bar and put weight gain potions in the kegs instead of beer causing the locals to blimp up, or by a farm to grow fruits and vegetables or raise animals (there is also anti-creepiness measures where it will detect if you add a mod that allows you to do “things” to the farm animals it immediately sends an email to the local authorities). and other businesses like potion shops, illegal ‘potion’ brewery’s, inn’s, etc. all with optional management quests.
a story that is there for when you want to do it, but all content is already available if you don’t care to do the story quests.
the ability to change aspects of the appearance of companions by using potions taking them to gyms, restaurants, and also dialogue. this will change their model and dialogue. btw everything is fully voiced including you Max the main character with a purposefully gender neutral name with multiple voices to choose from. they will also comment on your appearance.
both male and female growth (either can be disabled) as to give something to everyone. is there a fetish included you don’t like, you can turn that off too. maybe there’s one not included that you do want maybe you can add it with the modding tools depending on how complicated it is.
a leveling system where you have individual skills where you get a skill point to use in that tree every time you level up that skill. along with the typical leveling system you’d expect though this is essentially just a number.
completely optional multiplayer with public and private servers. or just invite your friends into your game.
saving works similar to terraria where you have separate character and world files.
custom difficulty like maybe you want to be an immortal god who has a hard time while gambling or someone who dies from strong winds but levels up at the speed of light.
and that’s all for now until I can afford to do some of this magic. I’m only 5 billion away from my kickstarter goal.