So, if you're looking for a unique Roblox username, then consider one of these:
Set your display name
Roblox now allows all users worldwide to change your Roblox account's display name in the account settings as a free feature. This is different than Changing a Username. How do I change the display name? Log into your account (If you can't log in, try these steps for resetting your password.) Go to account Settings
The DisplayName is a Player property that contains the display name of the authenticated user associated with the Player object. Unlike usernames, display names are non-unique names a player displays to others. If the Roblox user has not chosen one, the property will read the same as the Name property.
0:372:00How To Change Roblox Display Name - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo once you change to something you like click on save. And that's it you can now see my displayMoreSo once you change to something you like click on save. And that's it you can now see my display name is different from my username. And that's basically how to change your display name on roblox.
0:171:22How To Get A DISPLAY Name On Roblox?! (Change Your ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipButton right next to your robux. You go to settings. And then where it says account info so theMoreButton right next to your robux. You go to settings. And then where it says account info so the first step you go to display name so not username.
Head to Account Settings. Under your profile, there will be both a Display Name and Username option. Hit the edit icon beside Display Name.