While cabal leaders often have impact on the game there are always a few characters who really seem to embody roleplaying and player skills in a way that we really remember. Here are some that I felt really changed peoples views on things.

My top 5:

Amberlea - One of the first characters to gain respect as a bard outside of Troupe. Though the end of her carreer and the odd turns of her relationship with Istendil called her sanity into question in some of our minds, Amberlea was a dynamic personality not to be forgotten.

Neria - Any mage who manages to befriend ragers in any form has to get some recognition in my mind. Also showed that there is more to the game than just gathering power and mastering skills.

Genofen - Went out in a blaze of glory at then end of a strong carreer. Also really tried to mold the role of Emperor instead of just following in the ways set forth by Kah and Istendil.

Thror - Before immorted, his strong personality really changed the face of Battle and brought the cabal back from the brink. Of course he also really intensified Scottish Dwarf Syndrome, but I'd say it was a good trade off ;)

Llorenthos - A drow warrior who showed what it was to play with skill and style, at a time when people insisted drow warriors were laughable. Even got a river named after him.