Bill (played by David Carradine) is the fictional titular character for whom the movie Kill Bill is named. In the film, he is the leader of the Deadly Viper Assassination Squad, which included his brother, Budd (Michael Madsen). Bill's codename is "Snake Charmer".

His origins are not known, but his full name is revealed by Kiddo in the first movie. He collected father figures, the first of them a pimp named Esteban Vihaio. At some point he became the student of legendary swordsmith Hattori Hanzō (Sonny Chiba) and kung fu master Pai Mei (Gordon Liu).

Bill surfaces unannounced at Kiddo's wedding rehearsal at the Two Pines Wedding Chapel and promises not to interfere with her new life. When Bill meets Kiddo's soon-to-be-husband, Kiddo covers for him by saying he is her father. Bill wishes Kiddo the best of luck as he moves to the bride's side of the wedding chapel.

At the same time, the remainder of his assassin squad moves in from outside and massacres the entire wedding party. Bill delivers a final speech to Kiddo, after which he performs the coup de grâce by shooting her in the head. Before he fires, Kiddo tells him that he is the father of her unborn child.

Kiddo miraculously survives the ordeal but falls into a coma for four years. When she awakens, she assumes that her baby died because of her traumatic ordeal. Kiddo then proceeds to hunt down and kill the remaining assassins of the Deadly Viper Assassination Squad.

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