The Deadly Viper Assassination Squad is the main antagonist organization in the Kill Bill movies.
The Codenames of all members but Bill are the names of snakes. Bill's codename is Snake Charmer and hence signifies him as the leader of the squad.
However, not all members are named after Vipers as the name of the squad suggests. The Black Mamba and the California Mountain Snake do not belong to the Viper family.
|Bill||Deceased||Snake Charmer||Was romantically involved with Beatrix, and the father of her daughter. Shot Beatrix, yet was murdered by her four years later.|
|Elle Driver||Unknown||California Mountain Snake||Bill's lover. Lost her eye to Pai Mei, whom she later poisoned. Murdered Budd with her Black Mamba, yet was left for dead by Beatrix a short time later, after losing her second eye.|
|Budd||Deceased||Sidewinder||Bill's brother. Owned a Hattori Hanzō sword given to him by Bill. Lived in rural Texas and worked at a strip club. He was bitten to death by Elle's black mamba.|
|O-Ren Ishii||Deceased||Cottonmouth||The former leader of the Tokyo crime world. Best friend of Sofie Fatale, and the unofficial leader of the Crazy 88 and Gogo Yubari. Murdered by Beatrix.|
|Vernita Green||Deceased||Copperhead||Left the Squad sometime after the massacre, and married Lawrence Bell, with whom she had a daughter. Vernita was tracked down by Beatrix four years after the massacre, and was murdered in front of Nikki's eyes.|
|Beatrix Kiddo||Alive||Black Mamba||Bill's former lover. Faked her death and almost married Tommy Plympton in rural Texas. Was shot (in the head) and left for dead by Bill, yet woke up after a four-year coma, discovering her daughter was delivered during her coma.|