Assassino for sure, Some of the stuff he's pulled off is just amazing, and inspired me to try an agi heavy build for the first time, he's always really fun to spectate. Also, Saul, HarmlessPeasant, Miley, and Kaoklai. I'm sure there are a lot more honestly, memories of when I first started playing cRPG are pretty hazy, I don't really remember names.
I miss dueling with Saul and Kaoklai even though they effortlessly kicked my ass every time.