elpepomon. Sounds like a mexican digimon. Which I personally find worse than what i thought before.
Still 6/10 with new knowledge
usually I make out this username like this because I use it for everything. Its supposed to be LX_Theo with capitals, but I guess I didn't go through and remember that for here. Sometimes it just LxTheo when I can use an underscore for a space filler.
As for the professional sounding, I disagree that thats anywhere near important. I think it needs a ring to it it most importantly. Something that draws interest and is memorable without throwing numbers in it.