How to Disable an Xbox Avatarby Jessica A. Tripp
Making an avatar is a basic part of setting up a new Xbox 360. But if you don't like your avatar anymore, or you just decide to start over, it is also fairly easy to delete one. After the avatar is disabled, or reset, you will not be able to access it again. But then again, that is the point of disabling it.
Press the round X button in the middle of the controller to bring up a menu of profiles. Click on your personal profile.
Go to the customize avatar screen and select your avatar.
Press the "Start Over" button. This will disable the current avatar and make it possible for you to start a new one.
- link XBox website support