The most earthlike ocean world in the Sephiroth System, the planet has a diameter of 27909.3 km giving it a gravity of 1.8 G. Its semimajor axis is 1.1 AU giving it a year length of 1.3 years. It has a very short rotation period of 11 hours and 26 minutes. It has an atmospheric pressure of 9.6 and a mean temperature of 30.8 °C. It has twelve moon, ten of which are captured asteroids.
Being much warmer than its counterparts Gilgamesh and Enkidu, Oonik’uuwo has no ice islands to speak of, just a planetwide ocean and a reservoir of life. Life on this world thrives better than on the other two worlds thanks to the warmer temperatures and the general conditions of the planet. The planet has a rocky ocean floor, only a few meters from the surface of the ocean in a few places.