Vulcans. Among the main casts, there's Spock, Tuvok and T'Pol and maybe M'Jel (I don't remember if they listed her amongst the main cast or not). In supporting roles there's Sarek, Vorik, Soval, T'Lynn and President T'Rina. Klingons as far as main casts go, Worf, B'Elanna and Ash Tyler. In supporting roles, Alexander, Gowron, Martok, L'Rell.Funny, after all this time which do we have more of as main or at least prominent characters? Vulcans or Klingons.