This is a question that is kind of vague. If it’s talking about pre-defined characters such as Drizzt or Bigby or Tanis Half-Elven or whatever, I don’t really consider them PCs. Even when I was involved in groups running the original Dragonlance modules, I didn’t really consider them PCs. They were NPCs that we’d temporarily stepped into playing.
It’s a tossup between three of them. First, is Endeleban Losteast (Delban). He’s a wizard and former Aes Saidarr of Cormyr. Second is the paladin Terun Eastmore. As a paladin of Helm, he followed a path slightly adjacent to what most paladin’s might call correct.