Well there are so many people we don't really need anyone to fulfill specific roles. But off the top of my head we don't have any Cavaliers, or Inquisitors - we might have an Inquisitor - otherwise we have at least one of every class I believe. Only 1 paladin, and I think only 1 alchemist.
I'd heartily recommend choosing something you know you will have fun with for a long time over picking based on what we have already.