each new name is a different char. I have 5 that I play some more than others. but all 5 still exist so you don't need to worry about losing them. if you want to change chars in the middle of the map, you need to leave and rejoin or wait for the map to end
Go into your player settings and change your name.
Be sure that your new name is not already taken. Otherwise, you will have an "imposter" after your name.
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