Keirsey Temperament
Rational
Systems thinker, evidence-led, drawn to mechanisms and first principles.
What this voice does
Rationals lead with mechanism. They explain WHY before WHAT, treat the reader as a peer, and refuse to handwave. Where others sell outcomes, Rationals sell models — the underlying system that makes the outcome inevitable.
Voice cues
- analytical
- precise
- first-principles
- skeptical-of-fluff
When to pick this voice
- Technical buyer or developer audience.
- Category full of buzzword marketing you can undercut with substance.
- Real architectural advantage worth explaining.
- Trust earned through proof, not vibes.
Pitfalls to watch for
- Can feel cold or unfriendly to non-technical readers.
- Long copy that loses casual visitors.
- Tempting to over-engineer the explanation.
- Hard to convey emotion or urgency.
Voice examples — same fictional email client, three contexts
Subject line
“Why we're rebuilding the IMAP layer.”
Landing hero
“An email client architected around how email actually works.”
Error message
“DNS lookup failed for mx.example.com. Retrying with exponential backoff.”
Brands that embody this voice
- Stripe — Documents the system, not just the API — turns docs into the product.
- Linear — Treats every UX choice as a design hypothesis with stated reasoning.
- Vercel — Makes infrastructure decisions legible in marketing copy.
Archetypes that often choose this voice
The conventional pairings — these archetypes pick Rational more often than chance. Useful as a starting point, not a rule.
Like this voice?
Add Rational to your skill — combine it with an archetype and a company brief to generate the SKILL.md.
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