Kyle is Stan's best friend. When stuff gets crazy in South Park, he usually is the most sympathetic and, along with Stan, provides the voice of reason. He's also Jewish, a trait which Cartman (his rival) loves to rip on him for.
Kyle enjoys basketball and briefly got a "negroplasty" so that he could play on the varsity squad. He has a little brother named Ike and at Christmas, often plays with his friend Mr. Hankey the Christmas Poo.
When he's not playing basketball or dreidel, he's teaming up with his friends to form Coon and Friends.