1. Junior/Background Cast
Actors who mostly fill the scene to create realism and atmosphere.
They usually don’t have dialogues or only minimal lines.
Their role is to support the scene visually — like party guests, office staff, college students, or people walking in the street.
Sometimes referred to as extras or background artists.

2. Tertiary Cast
Very small supporting roles, often with minimal screen time and fewer dialogues.
Sometimes they exist to build realism in the world (neighbors, clerks, bystanders).
Not central to the plot but can add color or trigger minor events.

3. Featured Cast
Small but highlighted roles – they stand out in at least one or two scenes.
Might have a few key lines, emotional moments, or actions that impact the story slightly.
Example: A police officer who helps the hero, a friend who delivers an important message.

4. Secondary Cast
Supporting characters with decent screen presence.
They may not drive the story but are regularly visible and contribute to the narrative.
Example: Family members, close friends, colleagues of the lead.

5. Primary Cast
The central group of characters around whom the story revolves.
Includes the protagonist, antagonist, and their immediate circle.
They carry emotional weight, appear in multiple scenes, and are essential for the film’s progression.

6. Second Lead
The actor who plays the parallel lead or important supporting protagonist/antagonist.
Their arc is strong and often runs side by side with the main lead.
Example: In a love triangle, the second lead is the “other” love interest.
Sometimes becomes the main attraction in sequels/spin-offs.

7. Main Lead
The hero or heroine of the story.
The entire narrative is built around their journey, struggles, and growth.
Commands maximum screen time, dialogue, and emotional investment from the audience.
Example: Shah Rukh Khan in Dilwale Dulhania Le Jayenge, Robert Downey Jr. as Iron Man in Avengers.

In short hierarchy of importance:
Junior/Background Cast → Tertiary Cast → Featured Cast → Secondary Cast → Primary Cast → Second Lead → Main Lead