To appear in a cameo role.
A piece of jewelry, etc., carved in relief.
A single very brief appearance, especially by a prominent celebrity in a movie or song.
A vile, wicked person.
An extremely depraved person, or one capable or guilty of great crimes.
Any opponent player, especially a hypothetical player for example and didactic purposes. Compare: hero (“the current player”).
In fiction, a character who has the role of being bad, especially antagonizing the hero.
A deliberate scoundrel.