Heh thanks guys, and since the story was asked for, I'll give it to ya.
Over the years on the net, I've often noticed people make demon names and try to act evil and cool (and fail miserably at that), and due to that I've come to develop a truly demonic persona based on my own beliefs. You often hear about angels who fell to darkness, but why not ever a demon who has raised above his own instincts, and walks both paths? As for the numbers, they just mean I'm the 5000th demonlord (and I needed something to distinguish myself from other demons). Fun fact: the story for the game I want to create is based on this very same thing. It's based off a demonlord who strives for peace among themselves and the humans, but because of his outlook on things, he gets betrayed by his very own generals, leaving him with only a few options. If he relies on his dark demonic powers, it would corrupt him and slowly make him evil, but due to the demons background, he can't exactly go looking for allies either. Suffice to say, he does find allies, but I only gave away the start of the plot...and if I ever do get to create it, I don't want to ruin the plot I have in mind. Don't worry though, It'll let you go both paths.
Hope you guys found the story behind my name interesting.