sidekick
nounUK /ˈsaɪd.kɪk/
US /ˈsaɪd.kɪk/
A sidekick is a friend who helps and stays with a hero.
The superhero and his sidekick fought crime together.
OTHER MEANINGS
2. A close friend who often goes along with another person.
He brought his sidekick to the party.
3. A person who assists someone more important.
The comedian's sidekick told jokes between acts.
4. A loyal follower or supporter of a leader.
The mayor's sidekick handled all his appointments.