The personal project of a very horny and kinky genius, the 51N-74UR Mk. 1 or "Sintaur" is best defined as a sexbot. Every part of this robot is constructed to meet the many, diverse kinks of the inventor, who squandered her genius on satisfying her lusts rather than contributing to the advancement of civilization.

A Centaur -bot, the 51N-74UR Mk. 1 possesses multiple personality modes, each with its own set of quirks. She is a futa with a massive horsecock.