The Sephi were a humanoid race native to the planet Thustra. Outwardly, the Sephi were similar in appearance to human stock, but had a thick spiral of hair-like material that grew from the crown of the skulls. This spiral was a source of personal pride for individual Sephi, who placed gemstones and other adornments into the spiral as it grew. The ears of a Sephi were large and close to the head, with tall points and drooping lobes. The chin was similar in many respects to the spiral on top of their heads, growing into a thick point as a Sephi aged. The Sephi were a long-lived species, with elder individuals living for more than 200 years.