[Endoperez]

Water Queens are good, but Air Queen are generally better. They fly fast, farther, AND they can cast Cloud Trapeze to teleport.
Earth Kings' innate abilities aren't as powerful as the other royalty's, but he's got twice as many hp as a water queen, and very nice protection. Not to mention the fact that the Earth king can cast Petrify at the Water Queen. Also, regeneration won't help against death, so soul slay, petrify, gifts from heaven etc which kill normal SCs also kill the water queens.