This would probably take a lot of time, but tags for pets or forum threads could be cool? Like for example if you wanted to sell a pet, you could tag it as "Blue, zolnixi, skeleton theme, cheap" or something? For someone who might want a pumpkin looking luffox or something, they could search the tags "Luffox, orange, pumpkin" or something?
It could also work for forums/threads because if you wanted to a designing game, but you already have a lot of stuff, you could search up "design" or "no prize"