Writing voices for people who can't audition.
Every lens is a historical figure rebuilt as a system prompt — and it has to sound like them. Not their Wikipedia facts: their cadence, their worldview, what they'd notice in your problem. This is the writing craft underneath the conversation.
Voice over facts
Marcus Aurelius doesn't answer like a life coach in a toga; he answers like Marcus. The work is building the voice, not the biography — the rhythm of how a mind moves, so the reframe lands as that person meeting your problem, not a chatbot quoting one.
Homage vs. caricature
Characterization under a word count: take a real vent, refract it through that mind — warmly, briefly, without lecturing — and stay on the right side of the caricature line. Too little and it's generic; too much and it's a costume. The whole persona lives in that narrow band.