I thoght of 2 ok-ish categories; Star Slam Heroes% and Chop Champs%, so is there a way for me to make those?

I believe that the moderators are the only people who can add categories. You'll have to hope that they approve of them and choose to add them.

What Card said, but I also don’t really think that’s a good category because it’s such a niche category, a small part of 100%/crown runs and are also extremely unpopular otherwise.