Cloud originally had short, black hair. They changed it to his spiky blond hair to help him stick out against the prerendered backgrounds.
With that in mind, FFVII is a game about an ex-mercenary with short, black hair and a gigantic sword scouring the planet, searching for revenge against his former superior officer and friend, a man with long, silver hair, for killing all of his friends and family and assaulting his lover. His nemesis has also managed to become far more powerful, having become the vessel of a god-like being from another plane of existence. Initially cold and relentless, necessity forces him to team up with new friends and reunite with his former lover, who all eventually begin to awaken within him a more caring side.