Rin Matsuoka, the most beautiful boy in the Japenese anime series "Free! Iwatobi Swim Club".
Rin Kagamine, a vocaloid, faternal twin sister of Len Kagamine
Rin, a minor (male) character from Final Fantasy X and X-2.
Rin Tohsaka is a character in Fate/Stay Night
Rin Kuojo is a character in Ghost Hunt (albeit pronounced as Lin)
Isuzu "Rin" Sohma from Fruits Basket
Rin/Lin from Spirited Away
Rin is a character in InuYasha
Rin Nohara, a character from manga/anime Naruto
Rin Okumura, Blue Exorcist (male)
Pronounced reene, as in lean or keen
Rin, a character in the anime/manga series "Naruto Shippuden"