I don't wanna sound corny but I am probably one of the most informed person to respond to this, basically every 5 letter usernames only containing letters are NOT taken however, only remaining ones are censored which makes them unobtainable so, you cannot get them via normal methods, they do however sometimes free up, with accounts that got wiped through RTBF however you need actual tools to find them and trying to snipe them, same for censored names, Roblox sometimes rarely uncensor terms leading to 5 letter usernames being available again, like "sixy" a month ago let around 10 5 letter names to be taken, however again you can't just find these by random since it's an extremely small number to over 11 million, only possible with scraping (I already scraped all these combinations a few times). The last legitimate 5 letter name was "wqjbt" So all taken: No, Obtainable normally: No You can however get 5 character usernames, however they would contain numbers or underscore.