Oh sheesh, well it's impossible to list them all out because I was banned on sight for a while and I had a bunch of legitimate alternate accounts because I had nothing else really going on in my life at the time.
I initially joined in 2004 as tommyboy1334 and only posted on the GTA:SA forum. I was trying to figure out how to fly the crop duster to the moon. (You cannot do that) After a while, I made my way around to other forums and found C&C, and signature making. I became a Julz clone (Julz6) and was making faded ASCII signatures for a while. Then I changed my name to Tommy! and found my way into PIMI. The moderator "Tommy" at the time took this as impersonation and forced me to change my name. I went with Tommy Boy. Around this time, I convinced an inactive member from 2001 to give me his account, Whoreboy. I just used the forum contact list and sorted by oldest accounts, got his email address from his profile, and asked him via email. He gave me his password immediately and did not care if I merged his account into mine. Instantly, I was able to do a lot more on GW like change my CT, and my rep exploded. (lol) This, along with a few other events, inevitably led to my eventual ban on sight to be enacted. I had various alts during this period but the most notable two were "Chippy" and "ApolloTheSun". I think it held for 14 months before it was finally reversed. I really don't remember why it was reversed but I think it had to do with Ben (Blind Guardian) and Brig becoming my actual friends and then undoing it. In any case, I remained Tommy Boy until the last day of the forums.