The Simborg are a term applying to Simbots, Plumbots, and Imaginary Friends. They are the only supernatural that are created by Sims. However, bringing a “bot” or “imaginary friend” to life requires Xenosi technology.
Many Simborg desire to be human, and this often causes problems with their circuitry and neural pathways when they exceed their programming. Supposedly, some mad scientists have created the ability to give Simborg sentience, but this is all speculation.