Raptarr is a member of the Avian, a race of angel-like people who centuries ago had freed themselves from the Y'Lyntian race, who had mutated them from normal Human stock to serve as slaves, flying guards and workers. Raptarr originally served as a warrior and defender of his people, until his former friend Mephos succumbed to the lust for power and after the reign of Avian City sought to enslave the human race from there. After a Civil War in the aerial Avian City, Raptarr voluntarily took up the task of staying on Earth and watching over its instigator, the Avian Mephos, who had been defeated and exiled to Earth following his capture. Once there, he began to harbor sympathies for the people of Earth and begin operating as a super-hero, called the Guardian Angel, to come to their aid and repeatedly foiled Mephos' plans for revenge.
