Establish the situation everyone is entering
Describe the location, what has just happened and the facts the whole group should know. If a discovery is supposed to belong to only one character, make that distinction clear rather than presenting it as shared background.
A group supports two to ten chatbots. Check member visibility alongside the group's sharing setting. Putting a Private character into a group does not make that character freely publishable, and the visibility choices need to be compatible.
Keep the next response with the right participant
When a question is directed at one character, use the responder controls to keep the exchange focused. Automatic selection is available where your plan includes it, but it can still be useful to choose the member who has a reason to answer next.
One card written to portray several fictional people is not the same setup as a group of individual bots. Either can support an ensemble premise, but they do not provide interchangeable member and response controls.
Questions
What is the member limit for a group conversation?
You can include from two to ten chatbots. Use the group member controls and check that each character's visibility fits the intended sharing setting.
Is a card tagged Multiple Characters already a group?
Not necessarily. That tag may describe an ensemble written into a single card. A group conversation contains separate chatbot members and has its own group controls.