You can in singleplayer, but not on battle.net. First come, first serve.
It needs to be asked, but I wonder if they are going to do the same thing as when the Starcraft II beta came and I picked my name. I had an @ with a main account name, if I remember correctly. That reminds me of the Champions Online system.
On topic, mine would probably be
Why would I tell you? You'd take it, right?! xP
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Join the Irish Mob. We like almost everybody. Read Pants are Good. It's funny. You'll like it.
Also read Wintendo, as DINGBANG is attempting to play through 764 SNES games in a back catalog.