ChatDog gave me a nice list of ideas on building an engaging side character. I thought I would share.
Quick Side Character Builder
Creating a short-term character who feels engaging and emotionally resonant can enhance your story’s depth and keep readers invested. Here are some strategies:
1. Establish a Relatable Motive
- Give the character a clear, personal goal or problem that aligns or conflicts with the main plot.
- Example: A merchant desperate to recover stolen goods to save their family business.
2. Showcase a Unique Trait or Skill
- Highlight something memorable about them—humor, a distinctive way of speaking, or a peculiar skill.
- Example: A blacksmith who can mimic bird calls perfectly and uses it to communicate covertly.
3. Add Vulnerability
- Show their fears, struggles, or moments of doubt. Vulnerabilities make characters relatable.
- Example: A confident warrior who freezes when they see fire because of a childhood trauma.
4. Create a Strong First Impression
- Introduce them in a dynamic or intriguing way to grab the reader’s attention immediately.
- Example: A seemingly aloof scholar rescuing the protagonist with an unexpected act of bravery.
5. Build Relationships Quickly
- Establish meaningful interactions with the main characters or others in the world.
- Example: They bond with the protagonist over shared memories of a lost homeland.
6. Foreshadow Their Role
- Tease how they may impact the broader story, even if indirectly.
- Example: A passing character drops cryptic information about the antagonist, sparking curiosity.
7. Showcase Agency
- Let the character actively make choices rather than being passive or reactive.
- Example: Instead of merely tagging along, they devise a clever plan to escape danger.
8. Imbue Them with Mystery or Depth
- Hint at a backstory or unresolved issue that intrigues the reader.
- Example: A seemingly ordinary guide who carries an ornate dagger with a royal insignia.
9. Make Their Role Meaningful
- Ensure their actions have tangible consequences, even if minor, for the main story or protagonist.
- Example: They provide a crucial map but refuse to join, setting the stage for future challenges.
10. Give Them a Satisfying Arc
- Even a brief arc can be powerful. Show growth, resolution, or a moment of redemption.
- Example: A cowardly deserter finds their courage to delay a threat and save the group.

Quick Example:
A struggling thief (short-term character) helps the protagonist infiltrate an enemy’s fortress. Their personal motive? To steal a treasured locket belonging to their late spouse. Along the way, their wit and vulnerability endear them to the reader. Though they betray the group initially to secure the locket, they return at the climax, sacrificing themselves to ensure the group’s escape, leaving the protagonist with a bittersweet memory and a lesson about trust.
These techniques ensure your character leaves a lasting impression, even if they’re only around for a short while.
