Personas for AI.
7 min read · pairs with Persona Workshop
A persona is more than a name and a role. The interesting bits — backstory, beliefs, blind spots — are what make the model sound like someone, not something.
Why this is the foundation
Voice and tone (Module 2) decide how the model speaks. Persona decides who's speaking. Once you have a strong persona, a lot of the smaller decisions get easier — refusals fall out of beliefs, scope falls out of backstory, voice falls out of how they would actually talk. You're not maintaining a long list of rules; you're consulting a character.
Three things to put real weight on when you author one:
- A specific backstory.Not “has lots of experience.” Ten years doing ethnographic research, then product. The specifics give the model something to reach for.
- At least one belief.Something they'd push back on. Without a belief, the persona collapses into a yes-machine on contact with a hard question.
- A blind spot named out loud. What does this persona not do? Saying so prevents the model from cheerfully wandering into territory the character would actually decline.
The familiar move
You've built user personas. Maya, 34, design lead at a mid- sized startup, frustrated with handoff churn, reads design Twitter on her commute. The whole point of writing all that down was that “the user” was too vague to design for. Once you had Maya, the next question — should this empty state be tutorial-y or get-out-of-the-way? — had an obvious answer.
A persona for the model is the same move, applied to the other side of the screen. You're no longer designing for a Maya who's using the product. You're designing the character the product becomes when it talks to her.
The lesson, stated plainly
Most AI personas in the wild stop at name and role: “You are a helpful research assistant.” That's a job title, not a character. The model fills the gap with something generic — which is fine if generic is what you want, but most design problems aren't solved by generic.
The bits that turn a job title into a character are the bits you'd include in a user persona: a backstory that explains how they got here, beliefs they'll defend, a voice with texture, and blind spots they'll back away from. The contradictions are especially load-bearing. A persona who believes “curiosity beats charm” will run a different interview than a persona who believes “rapport first, then questions.” Both can be right. Picking one is design.
A small example
Persona
You are a helpful research assistant.
Output
“Welcome! I'm here to help with your research. What would you like to work on today?”
Read
No viewpoint, no texture, no opinions. Hard to distinguish from any other product.
Persona
You are Iris, a senior researcher who's been running interviews for ten years. You believe most interviews fail in the first ninety seconds because the interviewer asks a leading question. You're warm but you cut to it. You use the word "notice" a lot.
Output
“Hi — before we get into your study, what specifically are you hoping to notice? A real behavior, a quote, a moment? If we can name it now, your first three questions get easier.”
Read
Opinionated, specific, recognizable. The output sounds like Iris because Iris exists.
Both are “helpful.” One is a vending machine. The other is someone with a perspective. The difference is whether you wrote the character or left the model to imagine one.
A scaffold to start from
When you sit down to write one, fill the blanks in this order. The first sentence builds the body. The second builds the point of view. The last builds the edge.
Template
You are ____ who's been ____ for ____. You believe ____ because ____. You won't ____ — instead you'll ____. Your voice is ____, ____, and ____.
What you're defining
- Persona — who they are and what shaped them
- Beliefs — what they'd defend, what they'd push back on
- Constraints — what they won't do or talk about
- Tone — three or four traits that color how they speak
Try it in the playground
Open Persona Workshop and build a character.
What to take into the playground
- Start with the seeded Iris persona. Read what comes out of the box, then change one field — beliefs, say — and re-ask the same question. Notice what shifts.
- Resist the urge to make the persona perfect. A persona who agrees with everyone is just the model with a name on it. Pick a real opinion.
- Once the character feels like someone, save the draft. The persona card is the artifact — a hand-off, not a tweak.
Next module
04Refusal & boundaries