Rin Matsuoka is a fictional character from the anime and manga series Free!. He is known for his competitive nature and exceptional swimming skills, particularly in freestyle events. Rin has a complex personality, often displaying a mix of determination and vulnerability, which makes him a compelling character in the series. Rin is depicted as a childhood friend of Haruka Nanase, the main protagonist. Throughout the series, he struggles with his ambitions and relationships, particularly with his friends and rivals. His character development is central to the themes of friendship and rivalry in Free!.