This is, quite simply, a Siamese Cat without the typical Siamese coat markings. It has been called the ‘greyhound of cats’. The breed is now available in a bewilderingly large range of color forms.
Personality: as for Siamese.
Color forms: All colors are acceptible except the typical Siamese-pointed coat pattern.

Further reading for Oriental Sharhair lovers:
Oriental Shorthair Cat (Cats Set Ii)  by Stuart A. Kallen