A good sign of being an excellent role player is being able to role play different characters completely different, with different personalitites and traits very well. There are a few of those. One of the best I think was Ryan,
Ryan was great. Especially on Daelin, I would always get nervous around Daelin when I first joined, he was really scary, which is hard to do, and takes a good role player to set up an athmosphere just around a character, but he did it well I think.
He was the one that got my attention when I was young and foolish (and newbish). He wrote good stories, where a great RP'er and great ooc as well. So I guess I'd vote him as nr.1
I'll make a top 3
Octibluss apart from what everyone else said; for being so genuine ooc
Shadwell - Giving me loads of fun when I was a noob. Gained lots of experience, and I always enjoyed his different alts, awsome at playing different roles. Should apply for hollywood I reckon!
Other mentionables; Darath, young Hrothgar, Vince Valentine, Raiden, Kas Valentine (Great fun RP'ing with him while on Jack), Khae, Jessica, The Grd Besiegers (for always being great at making fun off and being terrible sports about it),
Everyone that role play around Trinsic (its always fun to be able to go there and laugh at them when bored), Dit, Sward, Sacrow (Vlad and everyother old shadwell char), Althalus, civilian kelly.