Honestly, I'd like to see more plain old fashioned characters like paladins who are honorable and good. I loved Keldorn in BG2 as well as Mazzy who had the heart of a paladin but couldn't become one as a halfling. It almost seems like there's a concerted effort to turn paladins evil.
There's too many companions who are already rare, unusual or with special qualities. Characters who are plain can have wonderful backstories and be down to earth and still be part the world of Faerun. There's too much effort to make the companions unique not with their personalities but with their special traits. Tell a good story with good characters and you don't need all the fancy stuff like vampires, werewolves and ticking time bombs to create conflict and struggles.
