Male Jets
- Riff, quick-tempered but zany leader of the Jets
- Tony, former joint-leader of the Jets, gone straight. Riff's best friend.
- Ice/ Diesel, second-in-command of the Jets. Ice was a character created for the movie, but has been adopted in later stage productions.
- Action, the most quick-tempered member of the Jets, always ready for a fight. Takes over as leader after Riff's death.
- A-Rab, a happy-go-lucky Jet who is beaten up by the Sharks in the opening sequence
- Baby John, the youngest Jet, A-Rab's best friend
- Snowboy
- Joyboy
- Big Deal
- Tiger
- Mouthpiece
- Gee-Tar
Male Sharks
- Bernardo, Maria's brother, leader of the Sharks
- Chino, Maria's hot-tempered suitor, Bernardo's best friend
- Pepe, second-in-command of the Sharks
- Indio
- Loco
- Jauno
- Luiz
- Rocco/Anxious
- Toro
- Nibbles/Del Campo
- Chile
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Female Jets
- Graziella, Riff's girlfriend (Ice / Diesel's girlfriend in some productions)
- Velma, Ice's girlfriend (Riff's girlfriend in some productions)
- Minnie, Baby John's girlfriend
- Clarice, Action's girlfriend
- Pauline, A-Rab's girlfriend
- Anybodys, a tagalong tomboy, eventually accepted into the gang and falls in love with Action
Female Sharks
- Maria, Puerto Rican ingenue; Bernardo's sister
- Anita, saucy friend of Maria and girlfriend of Bernardo, though they seem poorly matched
- Rosalia, argues with Anita in "America"; Indio's girlfriend
- Consuela, Pepe's girlfriend
- Teresita, Loco's girlfriend
- Francisca, Jauno's girlfriend
- Estella, Luiz's girlfriend
- Margarita, Toro's girlfriend
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