Pavo Mayura is a special, limited-appearance character in Saint Seiya Awakening. Her kit is centered on straightforward single-target damage with some minor self-protection. Sky Dance is her main attack and gives her a shield based on her C.ATK, Phantom Feathers temporarily boosts that C.ATK, and her Awakened skill lets her counterattack enemies that hit her before her turn. On paper, that gives her a decent self-contained damage loop and explains why she can feel annoying as a PvE enemy.
In practice, however, Mayura has never been especially useful and remains closer to a collectible unit than a real competitive pick. Her damage is not high enough by current standards, her defensive value is limited to a personal shield, and her counterattack mechanic is too narrow to make her relevant in PvP. She can still show up as a solid scripted PvE opponent, but outside of that she sees very little real use and is mostly remembered as a shop-exclusive curiosity.