Mine:
I was "Mister Blister" for a while on the SNES X-Band video game network in 1996/1997. I saw that name in the manual. I had tried several of the usernames I saw there. The rest were taken. I was messaged out-of-the-blue a few times from other users that thought I was a Catapult employee (and that's kinda the reason I did it). I had another account called "Nutbucket." One of the avatar pics was an alien head with visible brain. The low-fidelity of SNES made the brain look like peanuts...so I thought "Nutbucket" was a funny name.
Later, I couldn't get inspired. I tried a few things, like "FraggleGod" and something else. I missed X-BAND and started using zbattle.net to find other people to play SNES games against with the ZSNES emulator. I would play mostly Tetris Attack and Killer Instinct. There were a couple of challenging TA players (only a couple), and almost no challenging KI players (until Atmos showed up). To attract attention from KI fans, I named myself after a KI character's special move: B. Orchid's "Ichi Ni San" -- I already knew that it was Japanese for "1,2,3" -- but that's almost all the Japanese I know.