A hunchback helper is also known as a humpback assistant or a stooped aide.
Assistant
cuidiche (assistant, helper)
Assistant
accomplice, helper-in-crime
A magician's helper or assistant is sometimes called a famulus.
That is ASSISTANT (aide, helper).
Helper. Aide.
helper
another word for helper is a guider
An assistor is an assistant or helper, particularly in the field of law.
~aide ~ally ~helper ~assistant ~friend