I thought that it would be fun to learn about the origins behind everyone's user name on this site. I'll start.
Kashell is short for Kashell Triumph. Over 15 years ago, I registered on GameFAQs.com with the username of Kashell Triumph because I was playing both Thousand Arms (the main character's last name is Triumph) and Valkyrie Profile (my favorite character is Kashell) at the time. Ever since, Kashell has just kind of stuck. Some folks call me Kash, a few call me Kashy, some used to call me Kashy-Dahling (there's a long story behind that one) and other variations. And yes, it's Mr. Triumph if you're nasty.
Now, I make Kashell my username anywhere I'm able to do so. When I'm playing a new game that asks me to name the main character, I either use my real name or Kashell. It just depends on my mood.
What about the rest of you?