They appeared to be a partially crystalline based form of life with a brown-dark greenish smooth skin tone. They had a single circular eye that rested on their forehead which was also smooth in shape. When angered, they were capable of extending sharp blades from parts of their body to use as weapons against their enemies.
The Hrathi are capable of breeding with humans and creating offspring with them.
- All of the Hrathi shown in the series have an Omega symbol on their backs.