A grumpy and cynical black cat that only cares about himself. He’s shown to have a deep hatred of the other cats, often screaming at them, as well as, on several occasions, attacking them. He also likes insulting Shelby. He is always trying to get rid of the other animals in the house he lives in, but sometimes, in a hidden way, shows compassion for his family. He’s also terrified of penguins. He is a sucker for wet cat food. Despite all his hatred, Sylvester cares deeply about his family.