Origin: Based on Chinese & Native Lore
Guardians are a form of "created" Katsina, intended to perform as a medium between the spirit world and humanity.
After the People and most of the Chinese Wu left the Bay area, there are very few natural guardians, or Katsinas, left, and with the stirring beneath the city, they must be created.
To create a new Guardian, it must begin with a person who has both a Wu spirit, and who is willing to walk close to death's edge. In this state, usually assisted by opium, the new Guardian can visit the Diyu.
Previously, Guardians have usually sex workers - particularly in the gold rush, during the development of the city.