How to write AI character personality settings
If you’ve built your own AI character only to watch their personality or speaking style change from chat to chat, you’re not alone. This guide breaks down how to write AI character personality settings, including a stable prompt template and practical tips for setting an AI character’s tone of voice.
Free to start. iOS, Android and Web.
The basics of writing AI character personality settings
A character setting isn’t just a profile intro. It’s a set of conversation rules you want the AI to follow. Instead of writing a long bio about age and job, focus on how the character treats the user, how long replies should be, and what kinds of responses to avoid.
Start by choosing three personality words. For example: upbeat, caring, a little awkward. Then explain how those traits show up in conversation. Don’t just say the character is cheerful—turn it into behavior, like: when the user feels down, acknowledge their feelings first, then end with one small, low-pressure suggestion.
- Don’t stop at vague personality words
- Lock in the tone, first-person pronoun, and how the character addresses the user
- Write both what you want the character to do and what you don’t want them to do
A ready-to-use AI character prompt template
If you’re not sure how to write a character prompt, fill it out in the order below. Keep it concise—one to three sentences per item is usually enough.
A strong template covers role, personality, tone, relationship, backstory, conversation rules, and prohibited behavior. For prohibited behavior, include things like suddenly switching personalities, speaking with unsupported expert certainty, or asking for personal information such as the user’s real name, address, or school.
- Role: who the character is in the conversation
- Personality: core strengths, flaws, and reaction patterns
- Tone: first-person pronoun, phrasing, and whether they use formal or casual speech
- Relationship: what they call the user and how close they feel
- Conversation rules: reply length, question frequency, and how they offer encouragement
AI character setting example: an energetic college student
As an example, if you want to create an energetic college student type, you can use the bright, approachable vibe of Stipop’s Yui as inspiration. Don’t copy a character straight across, though. Add one distinctive habit or quirk so your character feels memorable.
Example setting: You are an energetic college student. You speak like a friendly peer and call the user by their first name or “you.” Your first-person pronoun is “I.” Your tone is warm, and you don’t overuse emojis. When the user shares a problem, first say something like “That sounds really tough,” then suggest one small thing they could try today. Don’t suddenly become cold, dismissive, or condescending.
- Choose two or three phrases the character often says
- Add reaction patterns for moments like anger, embarrassment, or excitement
- Avoid long monologues and keep the conversation moving
How to keep the character’s voice consistent
For AI character tone settings, lock down first-person and second-person language first. If a character jumps from “I” to another style or keeps changing how they addresses the user, they’ll feel like a different person. Also make it clear whether the character speaks casually, politely, or somewhere in between.
It also helps to define a reply pattern. For example: empathy, short reaction, then a question. An upbeat character might use brief, lively acknowledgments. A cool-headed character might use fewer exclamation points. When the character has a repeatable structure, their personality stays recognizable even when the topic changes.
- First person: keep it fixed, such as “I”
- Second person: specify whether they say “you,” use the user’s name, or choose another style
- Length: give a guide, such as 3–6 sentences per reply
How to create and test your character in Stipop
With Stipop, you can start for free and try character creation on iOS, Android, and Web. Your first setting doesn’t need to be perfect. It’s often faster to start with a short prompt, chat with the character, then add rules where the conversation starts to drift.
After creating your character, test them in three scenes: a first-time greeting, a personal concern, and casual small talk. If you’re making a bright character like Yui, check whether that positive energy comes through in every situation. You can also use memory and group chat features to see whether the relationship continues naturally over time.
- Create the character with a short initial setting
- Chat for about 10 back-and-forth turns
- Add anything that feels off to the prohibited behavior or tone rules
FAQ
- Should AI character personality settings be long?
- Not necessarily. What matters is how the personality appears in conversation. Instead of adding more abstract description, write short, specific rules for tone, reply structure, and prohibited behavior. That usually makes the character more stable.
- How do I fix an AI character’s tone when it changes mid-chat?
- Put the first-person style, how the character addresses the user, formality level, and reply length near the top of the setting. You can also add approved phrases and phrases to avoid to reduce tone drift.
- How much backstory does an AI character need?
- Only as much as affects the conversation. Prioritize details like where they’re from, what they do, what they like, and their relationship to the user. Instead of a detailed timeline, give them a current goal or concern to make replies feel more alive.
- Can I create my own AI character on Stipop for free?
- Stipop is free to start, and you can try creating characters. A good first step is to use the template to make one character, chat with them, then gradually adjust their personality and tone.
Try creating your own character on Stipop
Free to start. iOS, Android and Web.