Why does character drift happen?
Drift happens because you write over months and readers read in one sitting. After chapter 25 your working memory is full. You remember the plot beats and the voice, but the small fixed facts (Killian's job title, who his father is, which barracks he sleeps in) quietly shift each time you reference them. The reader holds all of it perfectly. The asymmetry is the problem, not your skill.
Which 4 fields should you lock for every character?
Lock relationship, role, location and what the protagonist knows. These are the facts that readers catch most often. 1) Relationship to protagonist (brother / coworker / commanding officer is NOT interchangeable). 2) Current role/rank (recruit vs officer vs assistant). 3) Current location (dorms vs apartment vs deployed). 4) Known-to-protagonist facts (does MC know his father is dead yet?). Everything else, like eye color or favorite food, matters less than you think.
What is a living-ledger workflow?
A living ledger is a character record you check while writing and update after every chapter. Skip either step and drift compounds. PlotWrite handles both: its Story brain keeps a page per character with facts timed by chapter ("Silver rank from ch 9"), reads the chapters you've already written to propose new facts, and holds them in your Inbox until you approve them. Nothing changes without your say-so. The Appearances grid (Story brain, Timeline) also flags characters who have gone quiet, such as "Mira hasn't appeared since chapter 41".

Keeping a long serial straight is the hard part. PlotWrite remembers every rank, skill and secret in your story and checks each new chapter before you post. Works with the Claude or ChatGPT plan you already pay for. Free for 7 days.
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How do you run a pre-publish canon check?
Run the new chapter against your Story brain with the Canon check before you hit publish. It looks for: stat regressions (a rank going backwards without an event), relationship inversions (brother → coworker), a dead character walking, location jumps (apartment → dorms with no move scene), and timeline contradictions (it was Tuesday last chapter, now it's Saturday with no time-skip). It shows both quotes side by side and offers a one-click fix you can preview as a diff. It takes about a minute and catches what a re-read won't.

Why does continuity matter for readers and income?
Continuity keeps readers following, and readers who follow are the ones who can pledge. Readers who comment 'the timeline is broken' tend not to stick around. Tools that protect continuity can pay for themselves if they help you keep even a few patrons. For more on the craft side, see how to fix canon contradictions without re-reading and the LitRPG writing guide.