A Custom Agent is a specialized version of the AI with a fixed identity (Persona).

1. Go to My Agents > Create New.
2. Name: e.g., "Math Tutor".
3. System Instruction: "You are a friendly 5th-grade math teacher. Use simple examples."
4. Save: This agent will now appear in your list.

When you chat with this agent, it will always stay in character. It is different from Zantkar/Karsaz which are general purpose.