13. Each member of the Deadly Viper Assassination Squad has a code name, related to a snake (Beatrix Kiddo aka the Bride is Black Mamba). What is O-Ren's code name?
From Quiz The Beautiful and Deadly O-Ren Ishii
Answer:
Cottonmouth
Vernita Green is Copperhead, Budd is Sidewinder and Elle Driver is California Mountain Snake. Bill, as the Squad's leader, is the Snake Charmer. The Bride was given the code name of Black Mamba due to being the deadliest assassin in the group and Bill's favourite (and Elle uses an actual black mamba to kill Budd in 'Kill Bill Vol. 2'), and Vernita is jealous because she thinks she should have been Black Mamba. When we see the Bride's kill list with the Squad's code names, 'Cottonmouth' is crossed out, showing that O-Ren is already dead, and her encounter with the Bride is shown as a flashback.
The cottonmouth, also known as the water or swamp moccasin, is a poisonous pit viper that is native to the US. Ironically, the California mountain snake is a non-venomous snake and is relatively harmless, but Elle Driver is easily the nastiest and most unhinged member of the Deadly Viper Assassination Squad.