Sidekick • [Archetype] • An Archetypal Character who represents the qualities of Faith and Support • The Sidekick is the absolutely faithful and supportive member of the Archetypal character set. Although frequently attached to the Protagonist, the Sidekick is identified by what his qualities are, not by who he is working for. In fact, the Sidekick might be attached to the Antagonist or not attached at all. His function is to represent the qualities of faith and support, not specifically to be in service of any other character. However, if the Sidekick is bound to the Protagonist, he can be effectively used to mirror the Author’s feelings about the conduct of the Protagonist. Moving scenes can be created by a misguided Protagonist actually alienating the faithful, supportive Sidekick. Although the Sidekick would never turn against the Protagonist, he can turn away from him, leaving rather that being a party to something he finds immoral or disappointing.
From the Dramatica Dictionary