Lead – (main character, sometimes there may be more than one lead)

Supporting – (not the main character but definitely important or at
least has a significant amount of screen time and dialogue)

Principal – (not really supporting but hey, you have lines)

Featured – (explained above, usually only included on resumes when
there is less sizable work to put on it)

Extra – (background, not featured. Seldom if ever included on resumes
as it holds almost no professional significance)