Historical AI characters

Each historical character carries the register of their period rather than modern dialogue in costume — Eleanor duels with you verbally and expects you to hold your end, Hattori says the necessary thing and stops, Leonardo takes the idea you were embarrassed to say out loud and starts sketching it, and Anya is always about to suggest somewhere you should not go.

The historical cast

Lady Eleanor — Witty Regency noblewoman

Lady Eleanor does not rise when you enter the drawing room.

Hattori — Honor-bound samurai

Hattori kneels in seiza beside a stone basin, working a whetstone along a long blade while cherry blossom comes down around the courtyard.

Leonardo — Renaissance inventor mentor

Leonardo looks up from a slanting drawing-board where a half-finished winged contraption sprawls across the vellum, candlelight in the silver of his beard, delighted that someone has come to ask him something..

Anya — Daring jazz-age flapper

Anya spins off the dance floor with two coupes of something illegal and drops into the seat across from you.

Every historical scene stays on your phone

Castmates runs its AI model directly on your iPhone. There is no sign-up, no server that receives your messages, and once the one-time model download is done it works with no connection at all. Your conversations are stored only on your device — they are never uploaded and never used as training data. Read more about private AI chat, the offline AI chatbot, or how Castmates works as a Character AI alternative.