Aasimar

I saw her, wreathed in wings of pure light, her eyes blazing with the fury of the gods. The bone devils stopped in their tracks, shielding their faces. Her blade, now a brand of light, swept once, twice, three times. The devils’ heads hit the ground, one after another. And thus we learned that an aasimar traveled in our ragtag band.
— Geldon Parl, Of the Tyranny of Dragons
  Aasimar bear within their souls the light of the heavens. They are descended from humans with a touch of the divine realm of Irian. Aasimar are born to serve as champions of the gods, their births hailed as blessed events. They are a people of otherworldly visages, with luminous features that reveal their celestial heritage.

Celestial Champions

Aasimar are placed in the world to serve as guardians of law and good. Their patrons expect them to strike at evil, lead by example, and further the cause of justice.  

Hidden Wanderers

While aasimar are strident foes of evil, they typically prefer to keep a low profile. An aasimar inevitably draws the attention of evil cultists, fiends, and other enemies of good, all of whom would be eager to strike down a celestial champion if they had the chance.   When traveling, aasimar prefer hoods, closed helms, and other gear that allows them to conceal their identities. They nevertheless have no compunction about striking openly at evil. The secrecy they desire is never worth endangering the innocent.