sidekick
US /ˈsaɪd.kɪk/
UK /ˈsaɪd.kɪk/

1.
compagnon, acolyte, bras droit
a person's assistant or close associate, especially one who is less important than that person
:
•
Batman and Robin are a famous hero and sidekick duo.
Batman et Robin sont un célèbre duo de héros et de compagnons.
•
Every great detective needs a loyal sidekick.
Chaque grand détective a besoin d’un compagnon loyal.