Big the Cat
From Sonic Retro
Template:CharacterSheet Big the Cat is a character in the Sonic the Hedgehog universe who was introduced in the video game Sonic Adventure.
Big is a simple-minded, 19-year-old purple tabby cat who lives in the jungle surrounding the Mystic Ruins. He seems to be a fisher for a living, and he lives with his friend/pet, Froggy (Kaeru-Kun). The plot of Big's levels in Sonic Adventure was that Froggy was possessed by Chaos's tail. The possessed frog sprouted a tail of his own, stole Big's lucky charm, a Chaos Emerald, and ran away. Big chased after him and eventually wound up on the Egg Carrier. Eggman gave Froggy to Chaos, both for Chaos' tail and the Chaos Emerald, but Big, with Sonic's help, rescued Froggy. Big took his friend and found the remnants of Tails' crash-landed Tornado II, and managed to fly it home to the jungle.
Big the Cat's gameplay mode is considered by many to be one of the strangest in the game. Simply put, he's the only Sonic character before or since that has had fishing levels.
He is seen in brief cameos unrelated to the story in Sonic Adventure 2, but most of these cameos were removed in the Nintendo GameCube remake, Sonic Adventure 2: Battle (some can still be activated by pressing 
repeatedly during certain cutscenes). Big is the power member of Team Rose in Sonic Heroes.
He is also a somewhat minor character in Sonic X.