Jennifer Lawerence
The actor for Katniss Everdeen is Jennifer Lawrence.
Katniss's hunting partner is Gale
Generally an actor with no dialogue is called an extra.
He is wearing a full body armor that covers MOST of his body
A person who acts as a reserve to a leading actor is called an understudy. They are typically prepared to step in and play the role if the leading actor is unable to perform.
yes.
Script
The Latin word for actor is actor. Sometimes histrio was used. A comic actor would be called a comoedus and a tragic actor a tragoedus. But the term actor covered all bases.
A speech by a single actor is called a Monologue.
I am not sure this is exactly what you want, but still, a female actor is called actress.
Her voice actor is called Corinne Kempa.
An actor