How to make video ads with AI avatars and AI actors

An AI avatar, or AI actor, is a generated presenter that speaks your script on camera, with lip-sync and natural movement. In UGC ads they're used to make creator-style videos, a person talking to their phone, without filming one. Synthetic UGC is quick to make and quick to change, which makes it a strong tool for testing. It also needs more care than it looks like it does.

When AI actors work, and when they don't

• Good fit: explainers, product demos with b-roll, offers and promotions, hook testing, and videos in several languages.
• Poor fit: testimonials, reviews and before-and-afters. These claim a real person's real experience, and an avatar doesn't have one.

Step 1: Pick the presenter like you'd cast a creator

Choose an avatar who could plausibly be your customer, with an energy that matches the product: calm for a sleep aid, bright for a snack, authoritative for software. Different presenters suit different audiences, so test more than one with the same script.

Step 2: Write for the ear, and keep it short

• Write how people talk: contractions, short sentences, no jargon.
• Keep it to 15–30 seconds. Shorter scripts sound more natural from an AI presenter, too.
• Open on the hook. No greeting, no name.
• Let the presenter introduce the problem, and let footage of the real product prove the solution.

Step 3: Cut to the real product

The presenter carries the message; your product footage carries the proof. Cut away to the product in hand, in use and close up while the presenter keeps talking. It makes the ad more convincing, and it shows the thing people are actually buying.

Step 4: Edit it like any other UGC ad

• Word-by-word captions for viewers with the sound off.
• The hook as on-screen text in the first second.
• Text and captions clear of the platform's buttons.
• A version for each placement: 9:16 for Stories, Reels and TikTok, plus 1:1 or 4:5 for feeds.

Step 5: Label it and keep it honest

Platforms including TikTok and Meta have rules about labelling realistic AI-generated content, and those rules change, so check them before you launch. More importantly, never script an AI actor to claim a personal experience: “I've used this for a month and my skin cleared up” from a person who doesn't exist is a fake testimonial, and in many countries it's illegal in advertising. Have the presenter explain and demonstrate, and attribute real results to real customers.

Used this way, AI actors aren't a shortcut around good advertising. They're a faster way to find out which message is worth spending on.