Link from The Legend of Zelda
Kiba is not the typical stay-at-home dog. He's a therapy dog and a service dog to his human caregiver. But he's not all work. Kiba is also a geek with a passion for cosplay. His Facebook page is filled with pictures of him at cons. Some of the best show him alongside humans who are cosplaying the same character.
Desmond Miles from Assassin's Creed
Mario from Super Mario Bros.
Yoda from Star Wars
Raphael from Teenage Mutant Ninja Turtles
-via Fashionably Geek