Allow users to add notes on other users
For example, I think X is a shitty poster but has good technical advice. Or Y is a troll from another forum, or Z is a relative.
None have avatars, or all of them share the same avatar, but I'd like to remember later what I've taken note of them for, so I can come back later and remember who is who, using my own mnemonic devices.
Andrew Toulouse commented
According to the SA thread, user notes is a thing but I have never seen it, so if exactly this is implemented, please make it more usable