The Skincrafters' Guild

The Skincrafters' Guild designs the avatars that Echoes and Wires inhabit within the Hollow. They also control the Entry Hall, where new arrivals to the Hollow initially appear in a default avatar while adjust to the Hollow and have their custom avatar created.

For more lore, check the WorldAnvil entries for the Skincrafters' Guild, Skincraft, and the Entry Hall.