You can put whatever you want (as long as it's within guidelines) in the customization area; it doesn't have to be your username.
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I know that, I just wanted it to be my username. I would make them the same across platforms, but Battle.net has a character limit one too short.
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Edited by ADragonWithin: 7/20/2019 10:10:45 PMAfter the move to Steam, your display name will be just like every other game that uses your Steam ID and not an actual in-game character name; it'll be whatever your display name on Steam is.