For the sake of conversation, let's just say that you could hypothetically change your username at any given time to anything you wanted.
Would you want to do it?
Personally, I like my name. It's a testament to one of my favorite childhood games, and I'm sure you've all played it.
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I won't give out my official choice, but I can safely tell you that, given the opportunity, I would change it to ANY username that I found to be more mature than mine (which is a PRETTY BIG scale).