Have you ever walked from one room in your house to the next, then wondered what you were there for? Yeah. Me too. I do remember that I’d gone there for a specific reason—only to find my mind completely blank. Why did I come in here? I find that happens occasionally when I’m writing and all of a sudden I can’t remember what color eyes I’d given my recurring police chief character. I was ready to put the color in the sentence and …

Was he blue-eyed in book 1 and suddenly brown-eyed in book 3? Had I mentioned his military background in book 2?

And where did I set the lake again? The one that’s mentioned in all of the books?

I scrambled through previous manuscripts, frantically searching for details I should have tracked from the beginning. That was time—a lot of time—I couldn’t get back.

I thought I would share what I learned the hard way about maintaining continuity across a series and how to set up something in one book that can carry over naturally into the next—and then remember to actually do it. Consider this your roadmap to avoiding my mistakes!

Let’s talk about character development and how to let people grow while staying consistent to who they are. Characters need to remain recognizable while still evolving. This means that your characters should feel familiar to readers from book to book.

They need to retain their:

• core traits,
• personality patterns,
• values or worldviews (although these can shift, you just have to make it believable), and
• voice and mannerisms.

Readers form emotional bonds with characters and expect them to feel the same from one installment to the next. If a character suddenly acts in a way that contradicts everything we’ve come to know about them—with no explanation—it breaks immersion.

Think about Sherlock Holmes, Jack Reacher, and John McClane. If Sherlock couldn’t solve a case, or Jack Reacher walked away from someone who needed help, or John McClane politely asked the bad guys to reconsider their life choices and waited for backup, readers would think they’d stepped into an alternative universe. These characters are wired for action, instinct, and doing the exact thing no one else would dare. Change that core instinct, and the whole story collapses. While staying recognizable, characters must also change in believable, compelling ways. This evolution keeps them from becoming flat or repetitive. Their experiences should shape them:

• They learn from mistakes.
• Their relationships deepen or shift.
• They heal, harden, soften, or gain new insights.
• They face new fears or discover new strengths.

Example: Katniss Everdeen begins as a reluctant participant in the Hunger Games, motivated solely by survival and protecting her sister. As the series progresses, she becomes a symbol of rebellion, a strategic player in a political war, and someone who questions the very systems manipulating her. Despite the trauma and transformation, Katniss remains fiercely protective, skeptical of authority, and driven by a deep sense of justice.

The balance matters. If your character changes too much, they’ll feel like a stranger. If they never change, they’ll feel static or unrealistic.

The key is to allow your character to grow in response to the story’s events, while keeping their essence—their voice, worldview, or emotional core—intact.

Tip: Create character sheets with physical traits (eye color, height, scars), background details (birthday, hometown, education), and psychological traits (fears, values, speech patterns). Update these as your character evolves, noting when and why changes occur.

What about you? What tricks have you discovered in your writing journey that allow you to keep up with your characters throughout the series? Or as a reader, what continuity errors have pulled you out of an otherwise great series?