I bet Nintendo has a lot of patent violations to choose from. They have a patent on such bangers as, rephrased from legal speech to human speech: “An air mount automatically turning into a ground mount upon landing” Source
According to Nintendo, if I understand this correctly, they have the sole legal right to make a bird mount that can also sprint on the ground if needed, because that sure was a special idea.
Hey, there are far worse options than Rin for doing so ;3