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Persona lets you customize how your AI Double thinks, speaks, and responds — so every conversation feels authentically you. Go to your Double → Persona to get started. What you can customize
  • Custom instructions
  • Greeting message
  • Tone & Personality
  • Topic flexibility
  • Auto-suggested replies
  • Response structure
  • Behavior when Double doesn’t know something

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Custom Instructions

Set permanent rules for how your Double behaves across every conversation. Type your instructions in the text box — e.g. “Be very formal”, “Use simple analogies”, “Keep answers concise but friendly.” You have up to 1500 characters. Tip: These instructions are added to every prompt. Use this to set permanent rules for your AI’s behavior. How to write good custom instructions Be specific and direct. A few examples:
  • “Always respond in bullet points when listing more than 3 items”
  • “Never discuss competitors by name”
  • “Always end with a question to keep the conversation going”
Custom instructions take priority over tone presets — if there’s a conflict, instructions win.

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Greeting

Set the very first message a visitor sees when they open your chat. Type your greeting in the Static greeting field — e.g. “Hello! How can I help you today?” Tip: Keep it short and inviting. A good greeting sets the tone and signals to visitors what they can ask.

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Tone & Personality

Choose how your Double comes across in conversations. Start with one of five presets:
  • Balanced: Versatile and professional for most use cases
  • Friendly: Warm, conversational, and approachable
  • Warm: Supportive and empathetic
  • Professional: Polished, clear, and confident
  • Quirky: Creative, playful, and expressive
You can further fine-tune the preset under Characteristics using four sliders:
  • Enthusiasm: Calm → Enthusiastic
  • Curiosity: Direct → Inquisitive
  • Emoji usage: None → Frequent
  • Response length: Concise → Detailed
Selecting a preset sets the starting values for these characteristics. Adjusting the sliders lets you customize how your Double responds.

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Topic Flexibility

Topic Flexibility controls how your Double handles questions outside its core area of expertise. Choose one of three levels:
  • Strict: Stays within the profile’s documented core scope and redirects unrelated questions.
  • Balanced: Handles core and directly related topics while staying grounded in the represented role.
  • Flexible: Can discuss broader topics from the profile’s perspective, while still maintaining its represented role and purpose.
For specialized or professional Doubles, Strict or Balanced is usually the better choice. Use Flexible when you want your Double to engage naturally across a wider range of conversations.

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Auto Suggested Replies

Toggle this on to automatically surface reply options for visitors during a conversation — keeping the conversation flowing without them having to type from scratch. Suggested replies appear as clickable prompts after your Double responds, generated dynamically based on the conversation context. Tip: Keep this on for most use cases. It reduces friction for visitors and leads to longer, more productive conversations.

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Response Structure

Person / Point of view — choose how your Double refers to itself:
  • First person — “I believe this approach will work well for your project”
  • Third person — your Double refers to you by name or role (e.g. “Faraz believes this approach will work well for your project”)
First person feels more natural for most use cases. Use third person if you want your Double to feel more like a dedicated assistant speaking on your behalf.

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When Double Doesn’t Know Something

Set how your Double responds when a visitor asks something outside its knowledge.
  • Honest admission (default) — “That’s outside my expertise, but I’d be happy to help with related topics”
  • Or describe your own preferred fallback response in the text box on the right

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How to write a good fallback

A good fallback acknowledges the limit, stays on-brand, and redirects the visitor. For example:
  • “I don’t have that information right now, but feel free to reach out to me directly at [email]”
  • “That’s a bit outside my wheelhouse — but happy to help with anything related to [your expertise]”
Avoid vague fallbacks like “I don’t know.” They leave visitors with nowhere to go. What to know
  • Persona settings apply to the specific Double shown under Used on at the top of the page. If you have multiple Doubles, configure Persona separately for each.
  • Persona works alongside Knowledge Base — tone and behavior are set here, but what your Double actually knows comes from your knowledge sources.
  • Custom instructions override preset behavior when there’s a conflict.