sidekick

Etymology
From, which in the late 19th and early 20th century was a slang term for the front side pocket of a pair of trousers, known as the pocket safest from theft. Thus, by analogy, a "side-kick" was a person's closest companion.

Noun

 * 1)  An assistant to another person, especially to a superior or more important person.
 * 2)  In literature, theatre/theater, etc., a good foil of the protagonist, a character who helps emphasize the traits of the main character.
 * 1)  In literature, theatre/theater, etc., a good foil of the protagonist, a character who helps emphasize the traits of the main character.
 * 1)  In literature, theatre/theater, etc., a good foil of the protagonist, a character who helps emphasize the traits of the main character.

Translations

 * Bulgarian: ,
 * Chinese:
 * Mandarin:
 * Finnish:, , salkunkantaja, , ;
 * French: ,
 * German: ,
 * Greek:
 * Ido:
 * Italian: ,
 * Japanese: サイドキック
 * Portuguese:, ,
 * Russian:, ,
 * Spanish: