I want more than anything some very visually distinct party members for the last few slots as what we have now so far are very boring aesthetically imo. My personal want is something very striking and unusual, like a tall and maimed no-nonsense vulture headed Aarakocra paladin.
I would want him to embody a depiction that goes hard on the "good is not nice" angle. An older/middle aged paladin who has no mercy or patience for evil, and who isn't an overly idealistic or impulsive fool. A "good guy" who actually comes off as intimidating, smart, hard to fool, and scary. More a Judge Dredd or Rorschach than the old boyscout idea of paladins.