Quetzalcoatl, the reason why this South American Goddess manifests in the Rider class is because of the Treasure she is currently summoning.
Heroic Spirits who have legends associated with certain mounts—limited not only to creatures—are suitable for this class. Even for Divine Beasts, Phantom Beasts, Rare Beasts, and abstract concepts of "riding," they possess absolute mastery, along with numerous legendary mounts as an enhancement.
The Cretaceous Winged Dragon she has currently summoned is actually a significantly enhanced Phantom Beast compared to the Feathered Serpent God Winged Dragon that once inhabited the Cretaceous period—a Fantasy Species of Divine Beast Level, rated A-level, and a Treasure against people and armies. Upon True Name Release, Quetzalcoatl riding the Winged Dragon can massively control wind, rain, and lightning...
However, the current need is not for such an Effect, so this Fantasy Species is used simply as a mount.
