Narrative Theory

The Villain: who struggles with the hero (formally known as antagonist)
The Donor: a character who gives something to the hero to help them on their quest.
The Princess: a sought-for person who exists as a goal and often recognizes and marries hero or punish villain.
The Helper: a character who accompaines the hero on their quest.
The Dispatcher: character who sends the hero on their quest.
The Hero: who departs on a search (seeker-hero), reacts to the donor and weds.
The False Hero: claims to be hero, often seeking and reacting like a hero.

Linear = beginning, middle and end in chronological order.
Non Linear = non chronological order.