OK.
All started from Ralph.
Ralph is the orange haired main hero of RPG Maker VX, he was very popular years ago and used to appear in a lot of script demos, one day I thought about killing him and resurrecting him as a villain.
Initially my avatar was just one of his many palette swaps that I made, with green hair, pale skin, a crazy evil smirk, black circles under the eyes and a dark armor, he was very similar to the Joker but with undead features.
Through the years the hairstyle slowly changed and so did everything else, I removed the spiky hair (main characteristic of Ralph) and used a style more similar to Dante from Devil May Cry.
No more pale skin and undead features either at some point (I was tired of looking rotten, haha), so my character took some distance from the VX Hero ultimately, and started appearing with a glowing red left eye and usually dressed with a black tuxedo.
The glowing left eye idea comes from the fact that in real life I have a scar right under my left eye.
Nowdays no more glowing eye either and I make him wear clothes he hates to wear (like you can see from his annoyed expression in my current avatar) but the green hair is still there and it's something that never changed from Day 1, and will probably never change.
Sadly all my old avatar images are lost, it's been years, but I had really a lot of them and for every occasion too (Halloween, Christmas, etc).
The username Dalph comes from mixing the letters of the words Dead + Ralph = Dalph, and the title Nega Ralph means Negative Ralph.