Using a Persona in Threads and Documents

How to apply a Euryka Persona (Character) inside a thread or document to control AI voice and behaviour.

2 min read Updated 27 Apr 2026

Once a persona has been created, it can be applied in Threads to control how the AI responds in that conversation, and in Documents to keep AI-assisted writing consistent with a particular voice or brand style.

Applying a persona in a Thread

  1. Open an existing thread or start a new one.
  2. Look for the Persona / Character selector in the thread input area.
  3. Click it and choose a persona from your workspace library.
  4. The persona is now active for this thread — subsequent AI responses will follow its behaviour and tone.

You can switch personas mid-thread. The history stays the same, but the AI's behaviour changes from that point forward.

Applying a persona in a Document

  1. Open an existing document or create a new one.
  2. Use the persona selector in the document toolbar or settings panel.
  3. Select a persona.

The chosen persona influences AI-generated content within the document — useful when you want all AI assistance in a document to follow a specific brand voice or writing style.

Practical examples

Scenario Suggested persona
Drafting a blog post for a client's brand "Client: [Brand Name]" persona with that brand's tone and guidelines
Researching a market opportunity "Senior Research Analyst" persona tuned for structured, cited analysis
Writing executive communications "Executive Ghostwriter" persona — concise, confident, polished prose
Running a customer support simulation "Support Agent" persona — empathetic, solution-focused, protocol-aware

Tips

  • Your onboarding Character is a great default — it's already tuned to your working style. Use it as a starting point for personal productivity threads.
  • Create per-project personas for ongoing client work so any team member can use the same consistent voice.
  • If a persona isn't working as expected, edit its instructions to be more specific. See Creating a persona.

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