TL;DR: One developer shared the exact prompt he uses to create a consistent AI influencer persona on Instagram. It’s structured, specific, and worth stealing.
What He Built
Erik Mattsson posted his working prompt for “Luna Voss,” a fictional 24-year-old Swedish fashion influencer, and asked the community for feedback. The prompt covers personality, physical appearance, content format (15-second Reels), hook structure, tone, hashtag count, and CTA. All in one block.
That level of specificity is not accidental. Vague prompts produce vague characters. Specific prompts produce content that sounds like the same person every time. When Erik writes “Luna speaks with quiet confidence and dry humor,” that’s a behavioral constraint. The model knows how Luna reacts to trends, how she phrases opinions, and what she would never say. That’s the difference between a character and a chatbot dressed in a persona.
He also included a defined aesthetic: muted tones, Scandinavian minimalism, clean compositions. That anchors the caption style, the hashtag choices, and even the way CTAs are written. Every piece of the prompt is doing load-bearing work.
Why This Prompt Works
Three things stand out:
- 📌 Persona first. Name, age, nationality, personality traits before any content instructions. The model knows who it’s playing before it writes anything. This ordering matters more than most people realize. If you lead with content requirements, you get generic output with a name slapped on it.
- Format constraint. “15-second Reel script” removes ambiguity. The model doesn’t decide the format, you do. This also forces the output to be punchier. A 15-second script has no room for throat-clearing. Every line has to earn its place.
- Engagement built in. “Strong hook in the first 3 seconds” and “natural, conversational tone” are in the requirements list, not just the vibe. When engagement tactics are part of the spec rather than an afterthought, you stop having to rewrite the hook every single time.
The other thing Erik got right: he posted it publicly and asked for pushback. Prompts improve faster when tested against other people’s edge cases than when iterated in a private notebook.
The Real Challenge: Visual Consistency
The top comment flagged what text prompts alone can’t solve: face and feature drift across images. Luna Voss might sound consistent in every caption. She won’t look the same in every photo unless you’re using a locked LoRA model or a tool like Midjourney with reference images.
This is the wall most people hit around week two. The first few posts look great. Then you generate a new batch and the character’s bone structure shifted, her hair is a different shade, and the lighting style no longer matches. Followers notice even when they can’t articulate why. The feed starts to feel off.
The fix isn’t one tool, it’s a repeatable process. Seed images, reference sheets, consistent negative prompts, and ideally a fine-tuned model trained on your character. Some creators use Stable Diffusion with a custom LoRA. Others use tools like HeyGen or Kling that let you lock a face across video generations. It adds setup time upfront, but it’s the only way to maintain visual identity at scale.
The prompt handles tone and content well. Visual identity is a separate system problem entirely.
Use Cases
- Building a niche lifestyle brand without hiring a content team
- Testing Instagram content strategies before committing a real face to them
- Producing high-volume content for multiple micro-niches simultaneously
- Prototyping influencer partnerships by simulating the content style first
Prompt of the Day
Here’s the full prompt from the original post, ready to adapt for your own AI persona:
You are "[Name]", a [age]-year-old [nationality] [niche] influencer. [Personality traits]. [Physical description]. Style: [Aesthetic description]. Create a 15-second Instagram Reel script + caption for the theme: "[Your topic]". Requirements: - Strong hook in the first 3 seconds - Natural, conversational tone like talking to a friend - High engagement focus - Max 8 relevant hashtags - Clear call-to-action at the end
Swap the brackets. Run it. Iterate from there. A good first test: generate five scripts back to back without changing the prompt and read them out loud. If they all sound like the same person, you’ve got a working foundation. If the voice shifts between outputs, your personality description needs more specificity. Add one concrete detail, a verbal habit, a recurring opinion, a thing she’d never post about, and run it again.
Worth Knowing
AI influencer accounts are already generating real revenue on Instagram. Some are running brand deals. A few have crossed 100k followers without a single real human photo in the feed. The barrier to entry is not the idea, it’s consistency across text and visuals over weeks and months. The prompt above solves the text side. The visual side requires a separate workflow with image generation tools that support character locking.
Start with the prompt. Figure out the visual system second. Most people skip step one entirely and wonder why the character feels off. They invest hours into image generation workflows before the persona has a defined voice, and then every caption sounds like it was written by a different person. Get the voice locked first. The visuals are easier to align once you know exactly who you’re depicting.
The accounts that last aren’t the ones with the most impressive images. They’re the ones where the character has a clear point of view and shows up with it every single time.
If you’re experimenting with AI-generated content strategies, what’s worked for you? Drop it in the comments.
Frequently Asked Questions
Q: How do I keep my AI influencer’s face consistent across multiple posts?
Fix the seed in your image generation tool and reuse it, that’s the single biggest lever. Replace vague descriptions like “blue eyes” with a detailed “face lock” spec covering exact face shape, nose spacing, eye color, skin undertone, and freckling. Critically, stick with the same generation tool throughout; switching between Midjourney, DALL-E, and others guarantees inconsistency because they interpret descriptions completely differently.
Q: Should I add personality guardrails to my content prompt?
Yes. Beyond describing your character’s core vibe, add a “what NOT to say” section to lock down voice consistency. For example: “Never use ‘besties’, ‘slay’, or gen-Z slang, Luna is Scandinavian, not a California lifestyle blogger.” These guardrails prevent the AI from drifting into generic influencer voice.
Q: What’s the biggest challenge when creating consistent AI influencers?
Face and feature drift across images is tougher to solve than content consistency. A strong content prompt keeps tone locked, but visuals require separate technical steps, seed fixing, detailed physical specs, and tool consistency. Most creators find that nailing visual coherence takes more effort than character voice.
AI Instagram influencer prompt that gave good results – feedback appreciated
by u/ErikMattsson06 in PromptEngineering