Different characters in a Thriller

Hero: A hero (heroine in female) (Ancient Greek: ἥρως, hḗrōs), in Greek mythology and folklore, was originally a demigod, their cult being one of the most distinctive features of ancient Greek religion. Later, hero (male) and heroine (female) came to refer to characters who, in the face of danger and adversity or from a position of weakness, display courage and the will for self sacrifice – that is, heroism – for some greater good, originally of martial courage or excellence but extended to more general moral excellence.
Stories of heroism may serve as moral examples. In classical antiquity, hero cults – veneration of deified heroes such as Heracles, Perseus, and Achilles – played an important role in Ancient Greek religion. Politicians, ancient and modern, have employed hero worship for their own apotheosis (i.e., cult of personality).

Villain: A villain (also known in film and literature as the "bad guy", "black hat", or "heavy") is an "evil" character in a story, whether a historical narrative or, especially, a work of fiction. The villain usually is the antagonist, the character who tends to have a negative effect on other characters. A female villain is sometimes called a villainess (often to differentiate her from a male villain). Random House Unabridged Dictionary defines villain as "a cruelly malicious person who is involved in or devoted to wickedness or crime; scoundrel; or a character in a play, novel, or the like, who constitutes an important evil agency in the plot".