Answer: A protagonist who has qualities of a hero
Explanation: A protagonist can be described as the chief act or one who leads or champions a particular cause.
However, being a protagonist doesn't translate into being a hero as heroes are often those who champion a cause with selflessness, ingenuity, strength and sound judgement.
Anton Chekhov, a Russian playwright introduced a technique which incorporated both, being a protagonist as well as heroic, that being the main character as well as possessing extraordinary qualities while changed the rationale for literature writing in the modern Era.