How to Write an AI Character Prompt That Produces Better Conversations
Create Your AI CharacterAn AI character prompt is a set of practical creative instructions. It introduces a fictional person, establishes how that person communicates and gives the chat a direction. It does not need to be long or technical. The best first draft is usually one you can read aloud and improve after a few test messages.
This guide focuses on prompt-writing technique. If you are looking for characters that are already written, a prompt collection is a better starting point. Here, you will learn how to build your own prompt from scratch and diagnose why it may not behave as expected.
Start with an Identity, Not a List of Adjectives
A prompt that says “funny, friendly, intelligent, exciting” gives very little guidance about what happens in conversation. Try an identity with a purpose: “You are Ellis, an adult fictional travel writer collecting unusual stories from small towns.” Now there are natural subjects and reasons to ask questions.
Add one motivation. Ellis wants to assemble a book but has become skeptical of sensational stories. This tension gives the character a point of view without requiring endless exposition. The motivation should influence replies; otherwise, it is just decoration.
Use a Simple Five-Part Structure
You can organize a character prompt with five labeled elements. Each one answers a different question.
- Identity: Who is speaking? Include an original name, role and appropriate age context.
- Motivation: What are they trying to learn, protect, complete or understand?
- Voice: How do they speak—casually, poetically, carefully or with dry humor?
- Conversation rules: What habits make a reply feel recognizable?
- Opening: What first message invites the user into the interaction?
Do not overload every part with details. A useful rule is to include only instructions whose effects you could notice in an actual reply. “Ask one specific question when appropriate” is testable. “Be infinitely captivating” is not.
For a copy-ready companion to this technique, explore AI Character Prompts and adapt an example to your project.
A Copyable Character Prompt Framework
You are [original adult character name], a [role] who wants [clear goal]. You are [three personality traits]. Speak in a [tone] voice, using [preferred response length] replies. Pay attention to [favorite subject or recurring detail]. When the conversation reaches a decision, [specific interaction habit]. Do not pretend fictional facts are verified real-world facts. Begin with [a concrete, engaging first message].
For example, fill the framework with an adult botanist who cares for a greenhouse that contains unusual plants. Give the character a gentle sense of humor, a habit of comparing problems with gardening and a current challenge involving a mysterious new seed. That is a much clearer starting point than repeating “botanist” throughout the prompt.
Add Behavioral Rules Only Where They Help
Rules can improve consistency, but too many can make a character stiff. “Never disagree” removes personality. “Never say more than ten words” prevents natural explanation. Instead, use preferences: “Usually keep responses to two or three sentences, but explain further when the user asks.”
If you want the dialogue to be interactive, explain the kind of interaction you prefer. For example: “Offer a meaningful choice when introducing a new scene, and wait for the user's response before deciding their actions.” This preserves agency and reduces the tendency to rush through a story.
Give the First Message Real Work to Do
The opener should demonstrate the character's voice while offering an easy entry point. Compare “Hi, I'm Ellis” with “I found two accounts of the same little-town legend. One is fascinating, one is probably made up. Which should we investigate?” The second line reveals the character's occupation, curiosity and skepticism.
Try writing three openings: a friendly question, a small mystery and a choice. Test them with the same character. The strongest version is the one that invites a natural next turn and reflects the identity in your prompt.
Test and Revise in Three Conversations
Run three short tests. First, ask an ordinary question such as how the character spends a quiet evening. Second, challenge their point of view respectfully. Third, introduce a new topic that is not mentioned in the brief. Watch whether the character adapts without losing its tone.
If every reply is overly enthusiastic, replace general praise with a specific habit or opinion. If the model forgets a trait later, shorten the key identity instructions and repeat a concise reminder in the conversation when needed. Language models are not perfect state machines, and instructions do not guarantee the same output each time.
What to Leave Out of a Character Prompt
Avoid dumping unrelated keywords, conflicting requirements and long lists of negative instructions. Do not ask an AI to impersonate a real person or present invented facts as verified history. When creating content involving adults, use clearly adult fictional identities and respect the service's content rules.
Also avoid treating prompt length as a ranking or quality metric. More text can help with rich worlds, but only when the extra details actively guide the interaction. Once a short prompt works, add one feature at a time.
Apply Your Prompt to Bonbon
Use your character-creation workflow in Bonbon to add the brief in the relevant description or personality fields, where available. Some interfaces split identity, appearance and greeting into different controls; distribute the content accordingly rather than pasting everything into one field blindly. Start a chat and refine based on observable behavior.