I was @serialbeggar during Live. I started on Infinity, but spent the later 2/3rds of the Live years on Triumph.
At first I only made a character on Triumph after learning a coworker had a character there. He was only a casual player, though, as was evidenced by the fact that he was still using TOs for his low 30s character. I tried to gather Inf to rebuild his character, but he drifted to other games by then.
I didn't come back to Triumph seriously until I saw someone on the Forums saying that they were organizing a Traps themed VG on Triumph, "The Trapsters". Unfortunately, The Trapsters fell apart after a few months due to low villain-side population and I took over the VG. I built the Base up from then and it was fully stocked. None of the VG membership ever popped back in even for a quick peek.
This was the only SG/VG I've ever joined. I had personal SG/VGs on Infinity, Triumph, Exalted, and towards the end, Virtue. I ran mostly solo, but in the later years, my "completist" desire burnt me out. I did all my teaming with PUGs via the server global chat channels, so I doubt I'm particularly memorable for any of you.
I'm on Everlasting now as @suddenly snazzy. (I forgot the global name was set on the first character name.)