Esperanza is a young Mexican American girl growing up in a working-class neighborhood in Chicago. She is highly observant and processes her feelings about her environment through poetry and writing. Her deepest wish is to have a house of her own, far from the suffocating poverty and patriarchal expectations of her community. She fears becoming trapped like the older women around her and strives for a future of independence.

Nenny is Esperanza’s younger sister. Her innocence contrasts heavily with Esperanza’s maturing perspective on the world. Though Esperanza often finds her childish behavior frustrating, the two share a deep cultural and familial understanding. Nenny remains firmly rooted in childhood while her sister moves toward young adulthood.

Mama is Esperanza's kind, artistic, and highly capable mother. Though she dropped out of school due to shame over her lack of nice clothes, she encourages Esperanza to prioritize education over relationships. She passionately wants her daughter to secure a financially stable future and avoid the traps of early marriage.

Papa is a hardworking immigrant from Mexico who works as a landscaper to provide for his family. He is a warm and loving father, though he holds traditional views about gender and family. His early struggles with the English language deeply inform his perspective on American society and survival.

Marin is a Puerto Rican teenager who lives with her cousin Louie's family. She serves as a captivating figure of young womanhood, possessing knowledge about makeup, boys, and the adult world. She dreams of getting a job downtown or meeting a wealthy man to completely change her life.

Sally is a glamorous classmate of Esperanza who uses makeup and fashion to appear older. She suffers from severe physical abuse at the hands of her strict father, who fears her beauty will bring trouble. Desperate for an escape from her oppressive home life, she seeks attention from neighborhood boys.

Rachel and Lucy are two Texan-born sisters who move to Mango Street and become Esperanza's first best friends. They pool their money with Esperanza to share a bicycle and explore the neighborhood together. The sisters share a boisterous, unfiltered approach to life.

Carlos is one of Esperanza's brothers. Like the other boys in the neighborhood, he lives in a separate social sphere from the girls. Though he speaks to his sisters inside the house, he refuses to be seen talking to them outside.

Cathy is a white girl who lives next door to Esperanza when the family first moves to Mango Street. Claiming to be related to the Queen of France, she owns a house full of cats. She tells Esperanza they can only be friends until Tuesday, as her family is moving away to avoid the neighborhood's changing demographics.

Meme Ortiz is a neighborhood boy who moves into Cathy's old house. He owns a large sheepdog and participates in dangerous childhood stunts, such as winning the First Annual Tarzan Jumping Contest out of a large tree in his yard.

Louie is a Puerto Rican boy who lives in a basement apartment. He is a friend to Esperanza's brothers and acts as a link to his older, more rebellious cousins who briefly capture the neighborhood's attention.

Alicia is an older girl from Guadalajara who attends university. Burdened with the domestic responsibility of cooking for her traditional father after her mother's death, she works incredibly hard to secure a better life. She provides a wise, grounding influence for Esperanza.

Aunt Lupe was once a beautiful, athletic woman with swimmer's legs, but she has been bedridden and blind with a mysterious illness for years. Despite her tragic physical circumstances, she is a deeply encouraging figure who urges her niece to keep writing.

Elenita is a neighborhood spiritual guide who tells fortunes using tarot cards, holy water, and religious objects. Operating out of a chaotic kitchen filled with her squabbling children, she provides Esperanza with a cryptic prophecy about a home in the heart.

Geraldo is an undocumented Mexican immigrant who works long hours in restaurants to send money back home. His anonymous death reveals the highly vulnerable and invisible existence of immigrants in the city.

Ruthie is the adult daughter of Edna, a volatile neighborhood landlord. She is a gentle, childlike woman who wears vibrant clothing and appreciates the beauty in small things. She remains isolated from the adult world, preferring to play cards with the neighborhood girls.

Edna is the strict, unforgiving owner of the apartment building next door to Esperanza's house. She dominates her adult daughter, Ruthie, and rules her rental property with an iron fist.

Earl is a jukebox repairman from Tennessee. He keeps late hours, hoards country music records, and occasionally brings a tall red-headed woman to his apartment, whom the naive neighborhood children mistakenly believe is his wife.

Sire is an older neighborhood boy who watches Esperanza with clear sexual interest. He represents the frightening but alluring world of teenage romance, testing boundaries as Esperanza transitions away from childhood.

Lois is Sire's petite, pretty girlfriend. She possesses the kind of effortless physical appeal that Esperanza secretly longs for, even as adults in the neighborhood judge her behavior.

Mamacita is an overweight, beautifully dressed woman who is deeply homesick for her native country. She refuses to leave her apartment or learn English, clinging fiercely to her culture out of fear that assimilating will erase her identity.

Rafaela is a beautiful young woman locked indoors by her extremely jealous husband. She spends her days dreaming of escaping her oppressive marriage and paying the neighborhood children to bring her drinks from the corner market.

Minerva is a young woman only slightly older than Esperanza, but already trapped in a turbulent marriage with children. She finds a brief, creative escape from her bleak domestic reality by writing poetry.

Tito is an aggressive neighborhood boy who flirts with Sally. He acts entitled and demanding, forcing interactions that push the girls out of their comfortable childhood dynamics and into premature adult situations.

The Three Sisters are elderly women who attend a wake for Rachel and Lucy's baby sister. Acting as mystical figures, they possess a deep intuition about Esperanza, encouraging her writing ambitions while demanding she never forget her roots.

Gil is an older African American man who owns a dusty, dark junk shop in the neighborhood. He guards a beautiful, mysterious wooden music box that mesmerizes Esperanza and Nenny.