The discussion revolves around hiding usernames from the user experience in a Discourse forum. raffoz wants to prioritize full names over usernames, hiding them in mention suggestions and posts. However, awesomerobot notes that completely hiding usernames is not feasible and proposes using custom plugins or CSS to achieve this.
raffoz explains that the goal is to encourage students in a private school forum to know each other by their real names, not usernames. darkpixlz and awesomerobot provide CSS code to hide usernames, but also advise against it due to potential abuse problems.
raffoz reports that the provided CSS codes work, but notes that usernames still appear when mentioning users. pfaffman suggests making usernames the same as real names to solve the issue, and pfaffman proposes disabling the “enable names” feature or using a custom plugin to achieve the desired outcome.
I unflagged:
I flagged:
In this case I still see usernames:
My goal is to:
Tks! 
It’s generally not feasible to hide usernames entirely; each user is required to have a unique username, but many users may have the same full name.
To prioritize using full names in mention suggestions, you’d need a custom plugin. I don’t think anyone’s built one that does that yet.
For hiding usernames on posts, some CSS should be able to handle it…
.topic-body .topic-meta-data .username {
display: none;
}
Note that this CSS change could cause some abuse problems. If usernames are hidden, I could change my full name and avatar to match someone else’s, and without a username it becomes much harder to see the difference.
Right. It would be easier to require (by rule) the username be their name and disable names.
Why do you hate usernames so much?
On top of that code,
.username {
display:none;
}
.user-main .about .details h2 {
display:none;
}
div.control-group.pref-username {
display:none;
}
I also advise against this, but there you go. I see no real reason behind it
In my forum, private one, I’d not give possibility to change real name.
I manage a little school and I want students using their real names, not usernames.
The reason is to encourage people to know each other, because they are students from the same school.
Tks for the code, I’ll try it! 
Question: is possible to disable real name change?
It works, just two notations:
If you make their user names their real names your problem goes away.
Yeps, it’s just I don’t like to see usernames (no spaces) and they would still be able to change their real names.
If you disable the “enable names” feature, they won’t have names, just usernames. You’d have to settle for _ rather than space.
Or you could write a custom plugin to do what you think you want.
If you don’t disable them as I suggest, you could hide the name changing stuff with CSS and have a community rule that if they changed their name (by un-hiding the CSS in their browser) that they would be appropriately punished.