So many to choose from.
Elempi's Jorje from "Friends of Nimrodel" is one of my newest favorites. A perfect example of what an animal character can be.
"Shadow of the West" remains one of my favorite RPG's, though in the end we lost most of our writers.
Aman's and Fordim's characters were both superbly done.
There are currently many enjoyable characters in "Fellowship of the 4th Age" - too many to mention, really. I love Tevildo's Azhar, Folwren's Kwell, Nogrod's Hadith, and Brinniel's Shae.
I loved all the Dwarf characters especially in "Red Flows the Sirannon" - an RPG that I think was well-written from all corners, which was why it worked so well. Another fun RPG.
And I know I'm forgetting so many more...