Protagonist, hero, narrator (if in 1st person.) However in some cases these don't have to be the same person.
On twilight, Bella is the main character. Katniss Evergreen is the main character in the Hunger Games.
Yes, it is a proper portuguese word, included in the main dictionaries.
antagonist.
The main character was the good guy.
Antagonist. Tormentor.
protaganist
The brain
If you mean a 'main' character in your story, you could say a "protagonist"... or a figure.
out going and helpful.
There are many..here are some 1. Round Character 2. Dynamic Character 3. Protagonist
The word Zeus is a proper noun, the name of a god from Greek mythology. A character from mythology can be considered a person or a thing, depending on your belief system The name of a person, even a mythical or fictional character is a proper noun.
Maybe whatever the main like main main character's name is. Whatever you think. it is your book!