The species was described as humanoid, with slender limbs & three-fingered hands. Their skin was a pale blue and Rokari was described as having large, expressive green eyes and blue-green hair.
The Jessar believed that words have actual, physical power over things, and did not have a word in their language for deception. Therefore, the Jessar were regarded as completely honest, with slaves taking a vow of silence during the revolt rather than lie to their Minyavish masters.