I spent quite a bit of time really trying to find a username that would concisely encapsulate who I am at the core. I drew a total blank, so I chose the name "The_Liquid_Laser" instead.
More elaboration: Since I couldn't think of something that describes myself, I chose something that illustrates one of my interests instead. I find it interesting that things which seem to be paradoxes can exist in reality. A laser cannot be made out of liquid, because lasers are made out of light by definition. And yet in doing a search I found someone using liquid lasers as part of their technology. Also the way the name is stated makes it sound like a super hero. A hero is someone people aspire to be, and yet the definite article "The" and the underscores make the name particularly obnoxious, which is something people do not aspire to be. Overall I tried to make the name as real and simultaneously paradoxical as possible.