My pen name is Proginoskes, but even though no user with that name is found by searching for it, the system claims there is. :Shrug: There must be some mechanism to prevent people from taking as a pen name the exact name of a known character: I stole mine from Madeleine L'Engle's most excellent novel A Wind in the Door. I unfortunately couldn't cram enough eyes and wings onto my avatar and still have a comprehensible image when shrunk to avatar size, but the human eye is a photograph of my own.
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EDIT 8th of March, 2011: I issue a silly challenge to Discworld authors! The following is taken from the Discworld MUD page:
Quote of the Moment
Somehow, trying to get Granny Weatherwax and 'panty raid' into the same
sentence is beyond me.
— (Terry Pratchett, alt.fan.pratchett)
Can you manage what pterry himself cannot?