Let's face it -- most roleplayers are heroes, villians, peerless veterans, or other Mary Sues. We want to feel awesome from time to time, and games let us do that. But after awhile, it gets old. Every guild leader you meet seems to be the head of a secret organization, the leader of one of Thrall's elite group of warriors, or a famous mercenary group that, for some reason, only works for the Alliance.
But they're not all like that. I'm not on an RP realm, but I've had a guildie who has been lightly roleplaying a simple Undead priest hell-bent on making babies with a Dwarf warrior. They both keep things within the game's context -- they don't speak each other's language but (not so) secretly try to meet up and communicate. It ends rather badly when the guilds shows up to kill the enemy lover, but the two still press on, shouting in Common and Orcish and emoting strange gestures in order to better try to express their love.
I've had people from RP servers try to get me to rally to their cause in the random Dungeon Finder, but they get shot down fast most of the time, and ... well, the game already calls me a hero every other quest, so it's lost its shine. However, when my guildie cries about seeing her potential Dwarven lover with another woman, then later finding out it was his evil twin, I can't help but chuckle a bit and even do some very light roleplaying myself.
Have you ever met someone who RPed something unique? A seer who was always wrong? A farmer's guild? A hard-working peon?