What's the the history behind your screen name? Doesn't matter if it's your current name or an older one.
Gun Star Hero is one of my favorite older games. Still got a copy of it on the Sega Genesis, actually. As for my older name, Celldweller is a musician I've liked for ages. When the Prospero boards came online back in 2003 it was the first thing to come to mind because Celldweller had just released his first big album.
I had a third name that was I used from early 2004 until late 2006, as well. At the time I was a pretty prominent member on the boards, versus being a lurker like I am now. Had around 20,000 posts on that name but I've never told anyone the account's name. Still not revealing that one, but the name itself was honestly just a garbled mess of Japanese words and an anime character's name.