I've seen Skychi many times, seeing as i have the same homeworld. talked to him for a bit once, he's pretty nice.
Saw Zezima twice i think. just in passing lol.
Talked to IAmTheRSGod several times, used to see him alot in edge.
RapManJeff, who is in 26th place overall. he was cutting magic trees in the elf place at the same time I was. talked to him for a bit, had him do his summoning emote for my youtube background pic =P
I think i saw tehnoobshow, not sure.
I've seen more "famous" people, I just don't remember lol.