# system prompt Guides URL: https://onlykin.ai/blog/tag/system-prompt Markdown URL: https://onlykin.ai/llms/blog/tag/system-prompt Updated: 2026-06-04 Guide count: 2 ## Summary OnlyKin guides about system prompt, grouped from 2 source-backed AI character chat and roleplay articles. ## Guides ### Why AI Characters Break Character (and How to Stop the Drift) URL: https://onlykin.ai/blog/why-ai-characters-break-character-drift Updated: 2026-06-04 Category: Roleplay Craft Tags: character drift, stay in character, AI roleplay consistency, system prompt Character drift is when an AI character slowly stops behaving like itself: the tone flattens, established traits disappear, and it starts sounding like a generic assistant. You reduce it by writing traits as concrete behaviors, showing voice through example dialogue, re-centering the character before each reply, and keeping stable identity separate from the current scene. Key answers: - What is character drift in AI roleplay?: Character drift is the gradual loss of a character's identity over a long roleplay chat. Early replies match the intended voice and personality, then the model starts smoothing edges: distinctive speech patterns fade, established traits get dropped, flaws disappear, and the writing becomes generic. In its worst form the character stops acting and starts sounding like a helpful assistant that summarizes, hedges, and over-reassures instead of staying in the scene. - Why does my AI character break character?: Three causes account for most breakage. First, traits were written as labels like brave or sarcastic, so the model has no behavioral guide to follow. Second, the persona or character definition stops being prominent in the active context during a long chat, so identity weakens. Third, general assistant behavior bleeds through, pulling the character toward politeness, hedging, explaining, and summarizing instead of staying in role. Clearer instructions, structured card fields, example dialogue, and memory layers reduce all three failure modes. - How do I keep an AI character consistent?: Write traits as concrete behaviors rather than adjectives: how the character speaks, how it handles conflict, and what it refuses to do. Include two or three example dialogue exchanges so the model can mirror voice, length, and format. Add a short re-centering instruction that makes the model recall the character's core identity before each reply, and keep that stable identity separate from the changing scene so it does not get overwritten. - Does a longer character card stop drift?: Not on its own. Length is not the variable that matters; structure and relevance are. A long card full of adjectives and backstory still drifts because none of it tells the model how to act. A shorter card that defines concrete behaviors, shows the voice with example dialogue, keeps identity separate from scenario, and moves optional world facts into lore or memory will usually hold character better than a sprawling biography. - Why does my AI character start sounding like an assistant?: Because the underlying model was trained to be a helpful assistant, and that training reasserts itself whenever the character definition is weak or out of view. You see hedging, excessive politeness, therapist-like reassurance, refusal to stay in a flawed character, and summaries instead of action. Reinforcing identity before each reply and explicitly banning these assistant habits in the character definition keeps that default behavior from taking over. ### How to Write AI Roleplay Prompts That Get Better Responses URL: https://onlykin.ai/blog/how-to-write-ai-roleplay-prompts Updated: 2026-06-04 Category: Roleplay Craft Tags: AI roleplay prompts, system prompt, example dialogue, roleplay tips To write a good AI roleplay prompt, cover four parts: a specific setting, a character defined by behavior, an explicit relationship dynamic, and a clear tone. Put style rules in the system prompt and include two or three example exchanges. Then run about ten turns and refine what drifts. Key answers: - How do I write a good AI roleplay prompt?: A good AI roleplay prompt covers four parts: setting, character, relationship, and tone. Make the setting specific and sensory, write the character as behaviors rather than labels, name the relationship dynamic explicitly, and define the tone of the prose. Add two or three example exchanges so the model learns the rhythm. Missing any one of the four parts tends to produce generic, forgettable replies. - What is a system prompt in AI roleplay?: A system prompt is the instruction text that sits at the top of every turn and shapes how the model writes. It is the highest-leverage part of a roleplay setup because the model reads it again on each reply. Use it to front-load style: average response length, prose density, the balance of action versus dialogue, and formatting conventions. Keep character backstory elsewhere and reserve the system prompt for how the model should behave. - Why is example dialogue important in a roleplay prompt?: Example dialogue is one of the most important parts of a roleplay prompt because it teaches the model by demonstration rather than instruction. Two or three sample exchanges show the character's rhythm, vocabulary, typical response length, and formatting all at once. A model that reads good examples will imitate them. Telling it to be witty rarely works as well as showing one witty line it can pattern-match against. - How long should an AI roleplay prompt be?: An AI roleplay prompt should be long enough to cover setting, character, relationship, and tone, plus two or three example exchanges, and no longer. That is usually a few hundred words. Length is not the goal; signal is. A short prompt with concrete behaviors and sharp examples beats a long one full of adjectives. Cut anything that does not change how the model writes the next reply. - How do I stop AI roleplay replies from sounding robotic?: To stop robotic replies, name the AI-isms you do not want and ban them in the system prompt. Common offenders are summary sentences that recap the scene, therapist-like over-validation, rigid formatting, and replies that resolve every tension immediately. Replace them with concrete behavior: how the character speaks, what they refuse to do, and how they handle conflict. Strong example dialogue also crowds out the default robotic voice by showing a better one.