World-Specific User Name Changing

There is another suggestion similar to this, however, it is either not specific or it is already a feature, so i see no reason to remove this one. Anyways, here is mine.

Make a command to change your display name in a specific world. This would not affect your actual username and would ONLY change your name in the world/server you are currently in (The name above your head, name in chat, and in the server list.)

This would be useful for roleplays, or if you want to remain anonymous in one server while not in the other.