What is body language?
AI Characters move with lively, expressive gestures by default, whether they're idle, speaking or showing emotions. The Body language setting adds a persistent way of moving on top of these gestures, so your character's body matches who they are in the simulation.
For example, an exhausted patient or an elderly customer can keep a slumped, low-energy body language throughout the conversation, even while talking or reacting with joy, fear or anger.
The following body languages are available:
Joyful (default): lively, upbeat gestures. This is how AI Characters have always moved.
Tired: a slumped, slower and slightly shaky body language. It suits exhausted, unwell or elderly characters.
Stressed: coming soon
⚠️ Custom avatars: Body language is designed for the avatars in the default avatar library. It may not work as expected with custom avatars. If you use a custom avatar, check your AI Character in the preview before sharing the simulation with learners.
How to set up body language
Open your simulation in the Simulation Creator and go to your AI Character.
In the Identity section, find the Body language dropdown.
Choose Tired, or leave it on Joyful to keep the standard gestures.
Existing simulations are not affected. Every AI Character keeps the Joyful body language until you change it.
What learners will see
The body language is blended with the AI Character's usual animations rather than replacing them. The character still gestures while speaking and still expresses emotions, but always with the underlying body language you chose.
When an AI Character with the Tired body language is thinking, only its face shows the thinking expression. Its body keeps its current movement, so a tired character doesn't suddenly switch to an energetic thinking pose.
Tips
Combine the Tired body language with the elderly avatar in the Appearance section and a matching voice for a consistent older character.
Use body language to support what your prompt describes. A character written as exhausted after a night shift, or discouraged after a long wait, will feel more believable with the Tired body language.