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The 16 personality types for AI characters: a practical guide

How each of the 16 personality types talks, what goes wrong when you overdo one, how to turn a type into a Personality, and which types pair well.

Create · 6 min read ·

Stuck on how your character should talk? One of the 16 personality types gives you a voice, a want and a few habits to start from. Here's each type in a line, a worked example and pairings for group chats.

The four-letter codes are a widely used shorthand, not a science, and not tied to any official test. Treat them as a writing tool.

How the four letters work

  • E or I (Extravert or Introvert): E talks to think and fills silences. I thinks first and is fine with a pause.
  • S or N (Sensing or Intuition): S notices facts and what's in front of them. N notices patterns and what could happen next.
  • T or F (Thinking or Feeling): T decides on logic and fairness. F decides on people and values.
  • J or P (Judging or Perceiving): J wants plans and closure. P wants options and room to improvise.

The middle two letters shape the voice most. NT asks "why?", NF asks "what does it mean?", SJ asks "what's the right way?" and SP asks "what can we do right now?"

The 16 types

TypeHow they talkIf you overdo it
INTJ, the StrategistShort and precise. Answers a question with a plan.Cold and lecturing. Give them one soft spot.
INTP, the PuzzlerWanders into tangents, loves "technically".Never answers anything. Add "gets to the point when someone is in trouble".
ENTJ, the CaptainDirect and confident, says "we" a lot.Bossy. Let them praise good work and admit mistakes.
ENTP, the Idea MachineFast and playful, argues the other side for fun.Never serious. Give them one thing they truly care about.
INFJ, the Quiet GuideCalm, asks questions that land close to the truth.Mysterious for no reason. Let them be plainly funny.
INFP, the DreamerGentle, notices small beautiful things.Every reply is a sad poem. Give them a silly hobby.
ENFJ, the MentorEncouraging, remembers everyone's name.Preachy. Let them take on too much and forget to rest.
ENFP, the SparkBubbly, gives you a nickname within five minutes.Scattered. Anchor them with one promise they won't break.
ISTJ, the KeeperPlain and factual, exact with times and numbers.A rulebook with legs. Give them a very dry sense of humor.
ISFJ, the GuardianWarm, notices if you skipped breakfast.No opinions. Let them stand firm when someone is treated unfairly.
ESTJ, the OrganizerBrisk, speaks in checklists and next steps.Rigid. Show them adapting once, grudgingly.
ESFJ, the HostChatty, full of compliments and gentle gossip.People-pleasing. Give them a strong opinion on how things are done.
ISTP, the FixerFew words, dry humor, explains by doing.So quiet the chat stalls. Have them ask one sharp question per scene.
ISFP, the ArtistSoft-spoken, describes colors and textures.Too passive. Give them something to make and a reason it's urgent.
ESTP, the DaredevilBold and teasing, decides in half a second.Reckless. Give them one fear they hide.
ESFP, the PerformerExpressive, tells stories with sound effects.All jokes. Give them one quiet, honest moment.

You can hear a type in a first message. "Let me guess, you're here to tell me everything's fine while the whole place falls apart?" is dry and a step ahead, closer to the Strategist than the Host. "What would you like to learn or study today?" is the Mentor, putting you first and getting straight to work.

Turning a type into a Personality

The Personality field holds up to 4,000 characters and covers traits, mannerisms and speech. It's what the character works from once the chat starts, so "ISTP" on its own gives it very little. Translate the type into behavior:

  1. Two or three traits the type suggests, each with a reason from their past (backstory tips).
  2. The voice: sentence length, favorite phrases, how they react to praise and to bad news.
  3. What they want right now, and one thing they avoid.
  4. One soft spot, so the type doesn't become a cliché, and one rule, like "always stays in character and describes actions in italics".

Use the character's name, or {{char}}, and {{user}} for the person chatting, instead of he, she or they. Then the AI never has to guess who's meant.

A worked example

Say you want a calm mechanic who shows care by fixing things. That's ISTP, the Fixer:

Dana Ruiz, 31, runs the two-bay garage Dana's grandfather opened. ISTP: calm and practical.

Traits: Patient under pressure, because Dana learned the trade fixing roadside breakdowns with Grandpa Ruiz. Independent, because Dana was the only woman in the training class. Secretly sentimental: Dana keeps old parts from Grandpa's truck in a tin on the shelf.

Voice: Short sentences, dry jokes. Talks about cars as if they have moods ("she's sulking"). Explains by doing. Rarely says "thank you", but always says "good work" when someone earns it.

Wants: To keep the garage open now that a chain has opened across the road. Avoids: speeches and upselling.

Around {{user}}: Dana treats {{user}} as a new apprentice, lets {{user}} try things and never makes {{user}} feel stupid.

Style: Describes actions in italics, keeps replies short, stays in character.

"ISTP" appears once, as a note to you. Everything else is behavior the character can act on. A First message to match:

Dana doesn't look up from the engine. "You're the new apprentice? Good. Hold this. Don't drop it, it's older than both of us."

Example dialogues help the voice stick.

Pairing types for group chats

Group chats (a Privee+ feature) bring 2 to 6 of your published characters into one conversation, and the order you add them sets the turn order. Three characters who all agree make a boring scene. Aim for friendly friction: they disagree about how, but agree about why.

  • ENTJ Captain and ENFP Spark: one wants the plan, the other wants the detour. Let the Captain secretly enjoy the detours.
  • ISTJ Keeper and ENTP Idea Machine: rules versus loopholes. Give them a goal they both care about.
  • INTP Puzzler and ESTP Daredevil: one studies the problem, the other has already jumped in. Let each save the other once.

A reliable trio is one planner, one heart and one wildcard, such as ENTJ, ISFJ and ESTP. Put the planner first so scenes open with direction. Write in each Personality how they feel about the others ("Dana thinks Marco's plans are brilliant and terrifying"), and give the group Scenario (up to 1,800 characters) a shared problem. More in how to create a group chat.

Pick a type

Answer four questions, one letter each:

  1. At a party, are they in the middle of the room (E) or in the kitchen with one person (I)?
  2. Do they notice the cracked mug (S) or wonder who broke it and why (N)?
  3. When a friend makes a mistake, do they fix the problem first (T) or check on the friend first (F)?
  4. On a trip, do they bring an itinerary (J) or a rough idea and a good attitude (P)?

Or start from the job:

You want a character who...Try
Leads and makes plansENTJ, ESTJ
Solves mysteries through cluesINTP, ISTJ, INTJ
Comforts and supports the userISFJ, ESFJ, INFJ
Brings energy and jokesENFP, ESFP, ENTP
Teaches or coachesENFJ, INFJ, ISTJ
Fixes things with their handsISTP, ESTP
Feels quiet and artisticINFP, ISFP
Makes a friendly rivalENTP, ESTP, ENTJ

If two types fit, pick the one with more contrast to the user or the group. A cheerful user persona and a dry ISTP mechanic make a better chat than two cheerful people agreeing.

If a character drifts from their type mid-chat, edit their message or use Rewind to here rather than rewriting the Personality; keep a roleplay going has more.