Little is known about the Naljian species. They inhabit an upper place of existence.
Appearance
The Naljians are large standing, semi-humanoids made of bright-white light who appear to have a flame of fiery blue fire/light around them. Naljians are white in colour and have blue/aqua flames around them.
Powers and Abilities
Naljians can teleport and they can use telekinesis. Naljians can easily live for millions of years. They are also apparently able to see in more than three dimensions as the one that spoke to Ben said that there were "only 26 (dimensions) that matter".
The Naljians are extremely advanced in technology and possess super intelligence, even more than the Galvan, as their children's toy could easily surpass the alien tech level (Level 20+) with the Omnitrix being Level 20.