Final answer:
One characteristic commonly associated with the act of a god revealing themselves is radiance, where the god emits light.
Step-by-step explanation:
One characteristic commonly associated with the act of a god revealing themselves is radiance, where the god emits light. This can be seen in the example of Demeter revealing herself as a goddess in the house of Keleos through her carrying a torch. The presence of torches in the traditional iconography of gods suggests their association with luminescence and the nocturnal setting of the initiation.