To whom did the ancient greek gods or roman gods show up?What is the modern theory on them?

Answer 1

I'm not sure I entirely understand your question. Are you asking for the names of individuals to whom the gods personally revealed themselves? Those individuals of history are as much myths as the gods themselves.

By seeking a modern theory on ancient gods, are you asking if there are some people out there who believe the gods have a tangible physical presence or were aliens from outer space? Only crackpots and psuedo-scientists claim such things, most people realize that myths exist to explain origins and provide a commonly agreed upon set of rules for living.

Even moving into modern occultism and paganism, it is generally recognized by the intelligentsia that the gods are archetypes, aspects of ourselves, not something existing outside of us.

Answer 2

Well i'm not quite sure i understand your question, BUT let me say that they are complete myths (hence the word Mythology) and people in those societies in that era made them up to explain the things they didn't understand. Like how the sun rises and sets, why it storms, etc.