Generally, Renlings are the same size as the kwamis. They have large heads, big eyes, and animalistic bodies, as opposed to kwamis. They are all bright red, with black swirl patterns, and on some, orange undersides. They all have lime green hair as of the concept art, when really they have sunshine yellow hair. They also seem to have purple mouths.
Renlings are divine beings that can levitate and are immortal. They can only be seen by the holder of the Prodigious, remaining invisible to everyone else. Unlike their cousins, the kwamis who can give different powers to their owners, the renlings can turn their owner into the animal they represent, as long the holder of the Prodigious possesses the value they embody.
The renlings seemingly correspond to animals that frequently appear in the imagery of Southern styles of martial arts. The Five Animals are the Tiger, Crane, Leopard, Snake and Dragon. Alternate sets replace the Leopard and the Dragon with the Monkey and the Mantis. Other animal styles include the Eagle and Bear among others.
Just like the kwamis, renlings are bound or connected to a certain object (kwamis with their Miraculouses and renlings to the Prodigious). However, each of the kwamis have their own miraculous; all the renlings are bound to one object together.