This thread will be for potential category suggestions. I am having a hard time thinking of very many categories other than the traditional Any%, so if you have a good Idea let me know!
One that may be interesting, Squid%. Talk to every squid in the game, the time starting at the start button and ending after talking to the last squid, which I think is the burglar in the courtyard of the castle that you see by multi jumping and "sells" muffins.
I would totally run squid%. Maybe Muffin%, grab all muffins. or 100% finish the game, talk to all squids and grab all muffins.
i feel like grabbing all of the muffins would be a difficult task to figure out just how much damage you would need to take, but an interesting puzzle none the less. And squid percent was decided with the help of the developer to be press down, or "wiggle" in front of every squid.
a '100%' category could just be All Squids and Finish the game. That could be interesting, you'd see all parts of the game instead of select sections pending on category ran.
I think a genocide run may be an interesting one, kill every enemy you possibly can (minus the knights and the gooey eye thing)