Rin is an Al Bhed merchant and entrepreneur who runs the various Rin's Travel Agency chapters across Spira in Final Fantasy X and Final Fantasy X-2. He also persuades Tidus to learn the Al Bhed language.
Rin appears to have a darker side to him in terms of machina being the future and the Farplane energy, as he reveals if Yuna points him as the one behind the Mi'ihen Highroad machina attack. In the aftermath of Final Fantasy X-2, Rin gets Shinra to be part of his big project.
Rin discovered Auron ten years ago when he had been injured by Yunalesca, and offered him a place to stay for the night at the Calm Lands travel agency, but by the morning Auron had already moved on. After Home's destruction, Rin begins to use the money from his business to fund its rebuilding.