Well, mine is a bit more complicated than just a videogame name.
Radical Dreamer is basically based on my personal belief that dreams have a deeper meaning than a simple "brain defrag" after effect. I settled on this name because of the videogame connotation, and the similarity to my belief that one should try to make life more dream like. It also draws to my spiritual side of things and the fact that I am at odds with mainstream ideas most of the time. In fact, way before I knew of Radical Dreamer, I sometimes called my philosophy the Radical Dream. At some point, I should write down the main ideas of the Radical Dream philosophy, but since I don't believe in imposing my ideas, it seems idiotic to write down "rules" to a philosophy that believes in being flexible.
Other names I have used included:
Ryushinigami (basically dragon god of death), Part of my "japanese" phase. I also picked it because dragons are cool (duh), and I was obsessed by my own mortality. I have also had a close relationship with death ever since I had to face my own life maybe coming to an end. (At this point, death feels like an old comforting presence waiting for me to be ready to leave this world.)
Seimei no Ookami. (Wolf of ???). When I underwent a "vision quest" type of ritual, the animal that appeared to guide me was either a wolf or a tiger. In this case, I was refering to a specific vision, and I think Seimei means something similar to light or life, at this point I don't remember.
Kage no Ookami. Changed it during a depressive self-destructive phase. Means "Shadow Wolf."
Arashi no Tora (Tiger of the storm). Still in my Japanese phase, basically this was due to a very specific winter storm where the icy snow pushed by the wind felt like something was clawing at my face. The wind sounded like a roaring tiger, and when I came home that night, my eyebrow piercing ripped out when I removed my shirt, as the skin was frozen around it. Looked like I had claw mark over my left eye until it healed.