3) Meleys

Rider: Rhaenys Targaryen
It may be ironic that the Queen-That-Never-Was rides atop the crimson-covered dragon also called the “Red Queen.” But Meleys was undeniably large and powerful, as seen when she burst through the stone floor of the Dragonpit during Aegon II’s coronation ceremony before carrying Rhaenys to freedom in “The Green Council.”