Xx1337xSn1p3RxX or some variant.
Let us break down the name in parts, shall we?
Xx usually means the main name has been taken in some form. Already a bad sign for the name's originality.
1337. These people usually are not 1337.
x. NowXyouXneedXtoXgoXputtingXlettersXbetweenX,XwhichXisXjustXsad.
Sn1p3r. Not only was Sniper, Sn1per, and Snip3r taken in the exact same position for letters, but now you had to substitute numbers into your name twice. Again, a bad sign.
xX. Put at the end to make it symmetrical. Which makes it cooler?
EDIT: As for myself, prefer Geohound Ryudo or Onyx Oblivion of some sort. So, either the main character of Grandia 2, the most underrated RPG series ever, or Onyx (which I think sounds really cool) and my favorite game of all time, bar none (I sunk 2500+ hours of my life into that game).