Let's see... Usernames I've had over the years...
Best: HardLoveMessenger My most recent and all-time favorite, next to IdahoRose of course. It's from the lyrics of the song "Roses Are Red" by Aqua: It's invisible, but so touchable/And I can feel it on my body, so emotional/I'm on a ride, on a ride I'm a passenger/I'm a victim of a hard love messenger. According to some lyric sites, it's supposed to be heart love messenger, but I've always heard it as hard love messenger. Besides, "hard love messenger" looks and sounds cooler in my opinion.
Worst: Okanmi-chan It was a misspelling of the Japanese word for wolf, "okami", with the honorific "-chan" tacked at the end. I was only 11 when I made it up, so I guess it's excusable.