I'm not sure specifically without having read it in detail, but there could be a protagonist who represents the everyman trying to find his place in America.
Prior Walter is an important character. He is a man living with AIDS and his journey through illness and his experiences with the supernatural are central to the story. Another is Roy Cohn, a powerful and controversial figure who also has AIDS but is in denial about it for a long time.
The important characters include Steve Rogers (Captain America). His character arc leading to his death is crucial. Black Widow is important as she is part of the Avengers and Captain America's death has an impact on her. And then there are the new generation of heroes who are influenced by Captain America's death, like Miles Morales in some continuities. They are important as they represent the future in the wake of his passing.
Steve Rogers is the most important character as he is Captain America. Bucky Barnes is also important as his friend. Peggy Carter is significant as she has a romantic relationship with Steve and is a strong female character in the story.
Noodles is an important character. He is at the center of the story, and his experiences and actions drive much of the plot forward.
Tony is a really important character. He's a former member of the Jets and his relationship with Maria is central to the story. He's kind of the protagonist who gets caught up in the gang conflict because of his love for Maria.
Max is another key character. His actions and decisions greatly influence the story's development. He has a complex relationship with Noodles. Deborah also plays a crucial role. Her relationship with Noodles adds an element of love and longing to the story.
Steve Rogers, of course, is the most important as he is Captain America. Then there's Bucky Barnes, his sidekick. Peggy Carter is also important. She is Steve's love interest and a strong female character in the story. And the Red Skull is a major villain. He is Captain America's arch - enemy, representing pure evil in the comic.
It's possible that the main characters are those who are on a journey to discover the true meaning of America. They could be a group of friends traveling across the country, meeting different people and experiencing various aspects of American life, which in turn shapes their understanding of the nation and themselves.
I'm not sure specifically as I haven't read it, but they could be ordinary Americans from different walks of life, like a farmer, a factory worker, and a teacher.
One important theme is the struggle for racial equality. Black characters in these novels often face discrimination and fight against systemic racism. Another theme is identity. They explore what it means to be Black in America, dealing with cultural heritage and self - perception. Also, family and community play significant roles, showing how they support and shape the characters in the face of adversity.