Drift Is Not a Failure of Memory
A character who has been in play for months rarely breaks in one obvious moment. They drift. The voice loosens, the opinions soften, the sharp edges that made them interesting get sanded down by weeks of being agreeable in scenes. Then you reread an early thread and meet a stranger.
This is not carelessness. It is the natural pull of collaborative writing: you respond to what your partner gives you, and over hundreds of replies you accumulate more of their character's assumptions than your own.
Write Down the Three Things That Cannot Change
Not a full sheet — three lines. The thing your character wants, the thing they will not do, and the way they sound when they are tired. Everything else is allowed to move.
Growth is the point of a long roleplay, so a locked personality is worse than drift. What you are protecting is the spine, not the whole body. A character can become kinder, braver, or more broken and still be recognisably themselves if those three anchors hold.
Reread Your Own Posts, Not Just Theirs
Most writers reread their partner's last reply and nothing else. Once a month, read three of your own posts from the earliest arc. You will hear the difference immediately, and hearing it is most of the fix.
Watch for Borrowed Vocabulary
The clearest sign of drift is diction. If your partner's character says "regardless" and yours starts saying it too, something is leaking. Characters in the same scene should not sound like the same writer, and in long roleplays they slowly do.
Keep a short list of words your character does and does not use. It feels fussy for about a week and then it becomes automatic.
Let Change Be Deliberate
When your character does change — and they should — mark it. A line in your notes: after the fire, she stopped making promises. That way the change is a decision you made rather than an accident you have to explain later.
The difference between drift and development is whether you could name the moment it happened.
Handle Long Gaps Honestly
If a roleplay has been dormant for a month, do not pretend continuity. Reread, then write one short post that re-establishes who your character is before advancing the plot. Your partner will be doing the same reconstruction, and giving them a clear signal is a kindness.
A profile helps here more than notes do, because it is the version your partner can check too. If your character's page still says what they want and what they refuse, both of you are working from the same document rather than two divergent memories.
