What are 3 main characters in the book House on Mango Street?
Esperanza (Hope) Cordero - the narrator and central character
Mama Cordero - Esperanza's mother
Papa Cordero - Esperanza's father
Many other characters come and go to help create the fabric that is Esperanza's life. I think you could make a really strong argument that the setting itself is developed much like a character and is in fact a main character, but that's dealing in the abstract.