It’s kindda thing for gamers. But since my forum is for gamers, I’m gonna suggest this. There’s a lot of services that provides dynamic signatures, that track your stats and updates in N hours. It would be nice if Discourse had signature field in user profiles, so people could add stuff like this. Or just their favourite quotes as a text - you know, usual stuff for forums.
From design side - I like how XenForo aproached this. Signatures are hidden by default and they apear only when you mouse-over on someone’s post. This doesn’t create a visual mess with tons of images on page.