Dafuq is a Feld0?
The only connection I make to the name is Feldoh, who was this super badass squirrel in one of the Redwall books (Martin the Warrior, I think, bit I'm not sure), who used wooden javelins to solo like half a vermin horde and beat the shit out of their boss, who had chain armor and broadsword
Anyway, one of my favorite usernames is CalmChowder, which was made one of my friends, which he uses for almost everything. He even owns calmchowder.com. He says he's not sure what he's going to do with it, but you can go there and see the placeholder text
Another of my friends uses JewFroSamurai, because he had an awesome Jew fro for awhile in high school
Yet another friend of mine used to use they_call_me_juicebox
Also, MrCardboardTube, and orangeglacier.
Not to toot my own horn, but a few I've used in the past that I particularly liked were pocket_full_of_doom and MrMeltJr.