Romance novels (and Junior's drawings of them) are a motif in the novel, emphasizing Mary as a foil for Junior. For example, after Mary informs the family that she has run away and gotten married, Junior remarks on her choice:
How weird is that? It’s almost romantic.
And then I realized that my sister was trying to LIVE a romance novel.
Man, that takes courage and imagination. Well, it also took some degree of mental illness, too, but I was suddenly happy for her.
And a little scared.
Junior has long thought of his sister as the burnout who lives in the basement, so he is surprised to learn from Mr. P that she has a lifelong dream of writing romance novels. Historically, romance novels have been dismissed by many as frivolous or even a bad influence on readers, in part because they depict women who manage to prioritize their own pleasure and happiness. To Junior, they represent a fantasy of freedom completely incongruent with Mary's actual life. Junior believes that romance novels provide Mary with the same kind of escapism drawing gives him. He begins doodling imaginary covers of some of the books Mary might write based on events in their lives. Often, the doodles serve as a way to make light of awkward or even traumatic moments, such as the time he flirts with Penelope right after she has been throwing up in the bathroom. Junior draws an imaginary romance cover that makes fun of his own "fantasy" of kissing a girl whose breath visibly reeks of vomit. With this doodle, he both expresses his fantasy and shuts it down as a pipe dream.
In the passage above, Junior realizes that romance novels might be more than escapism for Mary: she is trying to turn her actual life into a romance novel. This realization makes Junior both "happy" and "scared" because it challenges the idea that anyone's life story is predetermined. If Mary can turn her fantasy into reality, what should Junior do with his own life? For that matter, how are his choices now shaping the world around him into something new? There is both enormous possibility and enormous responsibility that go with the power to write his own story.
For Mary, the fantasy cannot last. It literally goes up in smoke when her trailer catches fire and kills her. Junior is horrified at the idea that he is responsible for her death because he inspired her to leave the reservation. Still, even though Mary dies a tragic death, she inspires Junior just as much as he inspires her. Both siblings leave home in pursuit of a fantasy; Mary teaches Junior that he can expect the world to be cruel but that he can dream big anyway. Some of his dreams might come true, at least for a little while.
Rowdy and Penelope both function as character foils for Junior, who triangulates off of the two of them to build his own sense of identity. Rowdy and Junior were born two hours apart at the same hospital, and they have been inseparable ever since. Now that they are teenagers, the small differences between them are growing larger.
Both of their parents have struggled with alcoholism, but Rowdy's father is physically abusive and far less loving than Junior's. Rowdy channels his feelings into rage, whereas Junior expresses his through art. Mr. P tells Junior (somewhat problematically) that Junior has a future beyond the reservation that Rowdy will never have. Junior wants to escape the bleak future Mr. P lays out for Rowdy, but he struggles with the idea that he is abandoning an important part of himself along with his friend.
Penelope, meanwhile, represents the White privilege Junior grasps at when he goes to school in Reardan. Penelope is from a small farm town with mediocre schools, but she has money, safety, and social connections that are unavailable to most people Junior has ever known. Describing her as "translucent" and "white on white on white" in her volleyball uniform, Junior turns Penelope into a symbol of Whiteness. They become friends and even date, but she is never more than his "semi-girlfriend." This ambiguous language is humorous, emphasizing the awkward social dynamics of young teenagers. On a deeper level, it also represents Junior's ambivalent feelings about what he is doing in Reardan. He flirts with Whiteness, but it never quite belongs to him. He starts to worry that he has rejected the reservation only to find out that there is no place for him beyond it.
Rowdy helps Junior come to terms with his identity in Chapter 29, when he and Junior make amends over a game of basketball:
“I’m not nomadic,” Rowdy said. “Hardly anybody on this rez is nomadic. Except for you. You’re the nomadic one.”
“Whatever.”
“No, I’m serious. I always knew you were going to leave. I always knew you were going to leave us behind and travel the world. I had this dream about you a few months ago. You were standing on the Great Wall of China. You looked happy. And I was happy for you.”
Rowdy didn’t cry. But I did.
Rowdy has accused Junior of betraying his people by leaving the reservation. In this scene, Junior tries to make up with Rowdy by once again inviting him to come to school in Reardan. "We could still be the same as each other," he seems to be telling his friend. Instead of blowing up this time, Rowdy gently tells Junior about their nomadic ancestors who never settled in one place. The two boys are not the same as each other, Rowdy insists, but that is because Junior is like one of their nomadic ancestors. Rowdy is more anchored to the reservation than Junior is, but that doesn't mean Junior is any less "Indian." He simply embodies an aspect of American Indian culture that has become impossible for most people due to systemic influences.
Junior cries because Rowdy makes room for Junior to honor his community instead of betraying it when he pursues his goals. Rowdy's dream about Junior walking on the Great Wall of China even echoes something Penelope once said about her own dream of traveling the world. By offering Junior this expansive vision of his future and connecting it to his American Indian identity, Rowdy makes room for Junior to be ambitious in ways that were perhaps previously unavailable to him.