Rattans appear to look like bipedal, 3 to 4 inch tall rats. They have mangled fur and a extremely long, prehensile tail. Their fur color is most commonly black, but brown, white, and even green variants exist. They have sharp claws, small ears on the top of their heads, and large eyes that can help them see in the dark.
Rattans are genius when it comes to assembling technology, and use their powers to their advantage when manufacturing things. They are seemingly almost clueless on things related to the natural world, however, and are unaware of the pollution they cause. This has caused them to move to different planets 4 times.