How to request categories for games pls

If you're a moderator for the game, you'd normally ask the community about a new category and implement them if people like the idea.

The best course of action for yourself is to head to the community discord or the game's forum and post your idea, if there's a positive reception then it may be added but usually, people will be unwilling to add a totally new category unless it's a well-liked idea in the community. If it's a new game the moderators generally have free reign over starting categories. You could also message a moderator if it's a tiny community.

If it's a silly or arbitrary category, it's much more likely to be accepted if there's a Category Extensions page in my experience.