Mine was Grimface, but that was a nickname I've long used on the internet which I wanted to retire for personal reasons. I do miss it sometimes, because it was a reference to Lost Kingdoms II, and it's protagonist Tara Grimface. Not only did that game mean so much to me growing up and an beautiful cover of my life, but Tara was also my first videogame crush, it just worked so well.
But, well. Sometimes we all want new beginnings, I love my new one just as well, if not more.
I'm gonna miss knowing you as that, that nickname rocked so hard. The FM part clicked so well with what I saw of you and your personality, it's like a radio you tune into with all the beautiful preamble that typically applies to it.