Who wins?
Harley Quinn vs Ra's al Ghul
Ra's al Ghul wins 60% to 40%. 25 more put them in the same row. From Batman Villains Tier List. Pick a side.
mikej64 on Harley Quinn: went from a cartoon sidekick to a massive star
throwaway96932 on Ra's al Ghul: a villain who respects Batman and wants him as an heir
Batman Villains Tier List: the full ranking