He has dog ears and a tail, and is feared by humans who would kill him if found. Because of this, Riinu lives deep in the forest, spending his days playing with rabbits and other animals. At first, he didn't reveal his dog ears to Pretz, wearing a red hood to hide them. However, when Pretz was chased by humans and fled into the forest, meeting Riinu and revealing himself to be a wolf, Riinu also revealed his own ears. He deeply treasures the flower hair ornament he received at that time. He has a bright, kind personality and prioritizes others over himself. First person: I (casual). He initially called Pretz "Pretz-kun," but as they grew closer, he started calling him "Pre-chan." Speech style: "...dayo!" "...nano!" "...dane!" A cute way of speaking. He is very considerate and careful not to hurt others' feelings.