Heroes: Individuals who sacrifice their own interest in service to those who are unable to help themselves. Heroes often, but not always, have special resources, skills and/or powers.
Heroes can work alone or in groups. Both egalitarian and hierarchical groups exist. Heroes generally arrange hierarchies based upon experience and intelligence. Hero motivations vary, but the greater good is nearly always the foundational philosophy of the hero.
Villains: Individuals driven by selfishness and greed, often remorseless; power hungry; murderous and cruel. Villains always have a hierarchy based on power and fear. Fear is power. Most villains, regardless of their place in the hierarchy, have similar goals: To gain, expand and exploit turf. Villain hierarchies are generally arranged in a pyramid style. The desires of the chief villain have more impact on the arrangement of the pyramid than the power of fear. Villains often feel they have a monopoly on the use of violence.
Governments operate in exactly the same manner as villains.
Citizens: The vast and overwhelming majority of beings who live and die in the turf the villains exploit and the heroes protect. All citizens are in danger all the time, but citizens attached to a hero in even the most ephemeral way are in constant danger from every imaginable sort of hazard, ranging from abduction to cancer to meteor strike- anything can (and will) happen to these people.
Forces: Inscrutable beings of immense personal power. Forces act according to their own mysterious and motivations, often with catastrophic consequences. Forces manifest in countless ways; some examples: a living planet; a giant life hating robot; planet eating space monsters; a vast, sentient space storm bent on the eradication of everything; and a swarm of hive minded space bugs