How about Blizzard give you a code that can only be obtained with your Bnet, password and Auth code(if you are SMART enough to have one) That code would only allow you get your character data (your choice as Toned talked about. You could obtain different codes for different characters and the person could message you, and they would get the reply you were not online but the message would come through to any toon you were on.
maybe too much data to mess with on Blizzard's part?
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