protagonist

(noun)

prəˈtæɡənɪst

Definitions

The main character in a drama, movie, novel, or other narrative work.
In the tapestry of tales, the protagonist is the brave soul who dances at the heart of the story's grand waltz.

Example: In 'The Lord of the Rings', Frodo Baggins is the protagonist who embarks on a perilous journey.
An advocate or champion of a particular cause or idea.
A protagonist of causes is the fiery heart beating against the winds of change, charting courses in uncharted seas.

Example: She was a leading protagonist of educational reform in the 1990s.

Late 17th century: from Greek prōtagōnistēs 'leading actor', from prōtos 'first' + agōnistēs 'actor'.

hero, central character, leading role

antagonist, villain, opponent