I hide my true identity because people treat Aasimar differently. They think I can't relate to them. How could I, when my purpose was thrust upon me by a being not of this world? If not that, it's the opposite; the peasants heap unnecessary pleasantries and bestow unnecessary gifts, looking to receive a blessing I can't provide. No, it's best they think I am but a human - nothing more, nothing less.
Aasimar are planetouched humans infused with radiant power from one of the upper planes - Mount Celestia, Elysium, or Arborea. Contrary to belief (and the unfounded boasting of some), aasimar are not born of the gods, but rather have a mental link to being native to the upper planes. This celestial guide communicates via empathetic waves and visions, nudging the planetouched individual towards their preordained purpose.
Subraces:
Protector
Scourge
Fallen