There is a guy called "g" that came on my server and told everyone that he's hacking minecraft because he's got such a cool name and i saw that the minimum for creating a name is 3 chars but he has 1 char can i ask how? and how do i get a name like this it is also not correct that he has a 1 char but i cannot make 1 char or 2 please mojang FIX
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In earlier versions of Minecraft it was possible to create such names. It is considered intended that they still exist, see WEB-122.
IIRC, there were no name restrictions in the very beginning of Minecraft. Users with such names have kept their name, even after those restrictions were introduced.