Backstage hands are called "stage crew hands," or "techies". The lead techie is the Stage Manager.
The main character's helper could be called a sidekick, companion, or assistant, depending on the dynamics of their relationship and the role they play in the story.
A magician's helper or assistant is sometimes called a famulus.
The name of a King's helper depends on where they reign. A common name for this helper is Governor.
accomplice, helper-in-crime
a helper
Bart's dog is called Santa's Little Helper. Funny name!
i dont know from a helper at the mall
My best helper to play is Rocky since he is invincible when he's a rock
santa's little helper
Shamas or helper candle
The pony horse
a customer helper