I haven't told this story in a while.
It all started in around... 2000. ^_^ I found myself hooked on Yahoo! Messenger's chatrooms. They were really good back then -- especially the Pokemon ones. Everyone RPed there and had multiple userids. I had upwards of around 20. Anyway, my favourite one quickly became lightning_the_baby_pichu (and I had the accompanying Pikachu and Raichu accounts, too ~_^). I used that one a lot. It was named Lightning since, well, that noun goes quite well for an electric-type Pokemon, don't you think? I had other ones like "Fiery_the_Charmander" and stuff like that, too. XP
Finally, once I sort of grew detached from YIM, I found The Pokemasters forum and decided to join. I joined under the name chibipichu, which was basically my alias everywhere at the time. Some months later... I think around August, my account was either hacked (or so I believed at the time) or else I was just really stupid and I forgot my password and couldn't retrieve it since someone else had the e-mail address to the account. o_O; Regardless, I decided to reregister, but I had to think of a new name. I thought back to my old usernames and figured I may as well reuse them since I loved them so much. I took Lightning and... I've grown so attached to it over the years that I use it everywhere under different variations. ^_^
Oh, and now it's virtually impossible for me to type "lighting." I just can't do it. XD;