So you can remember who's who in the people who change their names like socks.
Usernames can't be changed though
I've seen a number of toots where they were hidden by long display names and such.
Also just in general it can be nice to give a nickname to a person so you can remember better who they are, and not just stare at the account name and go "uuuuh???"
Seeing as usernames _can_ be changed now, I think this would be useful to implement.
@expenses how can usernames be changed? We have @usernames, and names, why do we need "custom nicknames" (whatever that means)?
An example of how the Steam UI does it.

@wchristian I hate Steam, specially its UI. I think it is rubbish. I see no need for this request, nor a way to implement it on a distributed, federated environment.
@Fastidious Quite frankly, given that you don't contribute code to the mastodon backend, i think it's fairly irrelevant whether or not you can see a way to implement things.
Particularly since there is clearly one, as this would be data entirely local to each account, and nothing more than a modifier to the rendering for each user.
@wchristian I expect frankness at all times. Pardon me, as I did not know this was for contributors only. I will take my irrelevant comments else where.
Good luck with your persistent usernames.
Hi guys, was wondering if this feature has been implemented yet ? I'm newcomer, still new to ruby and rails and I'd like to contribute this project.
I'd like to work on this feature. I plan to submit a pull request with the backend code and passing tests.
After that, if it gets merged I can work on the front end side of it.
Does that sound good?
@Gargron Since this is labeled as a suggestion, not sure if you want a pull request on it. But if you do, count on me.
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@wchristian I hate Steam, specially its UI. I think it is rubbish. I see no need for this request, nor a way to implement it on a distributed, federated environment.