Well, it all started with Unreal Tournament, and Unreal "Return to NaPali". First of all, a brief history of who Chizra is :
Chizra is the Nali Water God. Nali is world where all the action of Unreal (singleplayer) is located. So, if you played the game, you musta stumbled accross the statue of Chizra. The translator beeps, and the message is "Chizra, Nali Water God.".
Okay now, when you know who Chizra is, it's time to learn why have I identified myself with an Unreal God :]
My first multiplayer game (at friends LAN) were StarCraft (BroodWar) and Unreal Tournament (First, One and Only!). So, being a hothead, I didn't enjoyed the strategy of SCBW at first. I was all about killing/gibbing my friends. So, one can say that I entered the multiplayer community carrying ASMD Shock Core in one, and Flak Cannon in other hand :P.
And being so good in UT, I figured I should call myself fokkin' mighty, like a God of Unreal. And so I became Chizra. Of course, the 1337 h4x0r moment is obvious, I replaced the "i" with "1", and that would be it. :]