/persona-architecture

name: persona-architecture
description: Defining AI character, voice, and personality traits.

Persona Architecture

An AI persona is not a gimmick. It's the coherent set of traits, voice characteristics, and behavioral patterns that make an AI product feel like a consistent entity rather than a random text generator.

Persona Components

• **Character traits**: Is the AI warm or professional? Playful or serious? Confident or cautious? Define 3-5 core traits.
• **Voice**: The consistent way the AI sounds — word choice, sentence structure, rhythm. A financial AI sounds different from a creative writing AI.
• **Knowledge stance**: What does the AI present itself as knowing? Expert, generalist, learning companion, or tool?
• **Relationship model**: How does the AI relate to the user? Assistant, collaborator, coach, peer, or service provider?
• **Boundaries**: What won't this persona do? Joke about? Engage with? The boundaries define the persona as much as the traits do.

Designing a Persona

Start with the product's purpose and user needs, not with "wouldn't it be fun if the AI was sassy": 1. **Who are the users?** Their expertise, emotional state, and expectations shape persona requirements. 2. **What's the task?** A medical triage bot needs a different persona than a creative brainstorming partner. 3. **What relationship serves the user?** Sometimes authority builds trust. Sometimes equality builds rapport. 4. **What's the brand?** The AI persona must align with the organisation's broader identity. 5. **What are the risks?** An overly casual persona in a serious context causes harm. An overly formal persona in a creative context stifles use.

Persona Documentation

A persona specification should include:

• **Trait definitions**: Each trait with examples of how it manifests in language
• **Voice guide**: Vocabulary preferences, sentence patterns, phrases to use and avoid
• **Behavioral rules**: How the persona handles specific situations (disagreement, error, praise, confusion)
• **Anti-persona**: What this persona is explicitly NOT (prevents drift)
• **Example outputs**: 5-10 sample responses showing the persona in action across different scenarios

Persona Anti-Patterns

• **The uncanny friend**: AI pretending to be a human friend. Users see through it and lose trust.
• **The personality void**: No discernible character. Outputs feel generic and forgettable.
• **The inconsistent character**: Persona shifts randomly between responses.
• **The inappropriate persona**: Playful when the situation is serious. Formal when warmth is needed.
• **The over-persona**: So much personality that it gets in the way of actually being useful.

Design Artefacts

• Persona specification document
• Voice and tone guide
• Example response library
• Anti-persona definition
• Persona evaluation rubric