A sidekick is a person who supports or helps someone else, often a hero or main character. They assist them in their adventures or tasks, typically providing camaraderie, assistance, and comedic relief. Full definition
Before this season, Di María had been one of the best sidekicks of his generation. (theringer.com)
Then again, stranger things have happened: Universal is currently finding critical and commercial success with Minions, a movie about tiny yellow unintelligible creatures who few ever expected to transcend their status as comedy sidekicks in the Despicable Me movies. (theguardian.com)
GRAVY TRAIN Once acquired as sidekicks for kids, animal companions are more popular now with empty - nesters, single professionals, and couples who delay having children. (15thstvet.com)