In Dangerous Journeys the role taken by a participant, guide or player, is known as a Persona (plural Personae). The Persona represents the participant during play, interacting with the Personae taken on by other participants either player or guide. It s through him that a player lives his imaginary life in the world of the RPG, exploring, interacting, striving with or against others.
What sort of Persona one can play depends in large part on the sort of world presented by the guide in question. And on how one chooses to play the role. For our purposes what sort of Persona depends on whether one is a player or one is a guide.