Writing Sidekicks: The Character Who Makes the Hero

The best sidekicks aren't assistants. They're characters who happen to be standing next to the protagonist — with their own lives, desires, and moral positions. Watson makes Holmes more interesting because Watson is a genuinely interesting person who finds Holmes interesting. Samwise Gamgee isn't Frodo's helper; he's the emotional center of the entire trilogy.

The Sidekick's Own Want

A sidekick who exists only to serve the protagonist's story is a function, not a character. The moment you give the sidekick something they want — something distinct from helping the hero — they become real. This want can align with the hero's goal, run parallel to it, or create productive friction with it. What matters is that it belongs to them.

• What does the sidekick want that the hero can't give them?
• What does the sidekick want from the hero specifically? (Acknowledgment, loyalty, proof that goodness wins?)
• What would the sidekick do if the hero asked them to cross a line?

The Mirror Function

Sidekicks traditionally serve as mirrors — they show the protagonist (and reader) things the protagonist can't see themselves. The sidekick might be braver in small ways where the hero is brave in large ways. They might have the moral clarity the hero keeps second-guessing. Or they might embody the cost of the hero's choices in a way the hero can't quite face.

• What does the sidekick see about the protagonist that the protagonist denies?
• In what area is the sidekick wiser, more grounded, or more honest?
• When the sidekick challenges the hero, are they right? (At least sometimes, they should be.)

The Sidekick's Arc

Sidekicks often don't get full character arcs in less skilled hands. Give yours one. It doesn't need to be as elaborate as the protagonist's arc, but there should be something the sidekick believes at the beginning that changes — because of their journey, not just as a reaction to the hero's journey. The sidekick should earn their own ending.

The Sidekick Who Steals the Story

Sometimes sidekicks become the fan favorite — the character readers care about more than the protagonist. This is a signal, not a failure. Either the sidekick has been given more of what makes characters compelling (specificity, vulnerability, wit) or the protagonist has been given too little. Either way, pay attention to what you're doing right with the sidekick and apply it everywhere.