Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
First Person (Central Narrator) / Jude and Noah Sweetwine
Ugh, twins. They're always doing everything together, including narrating this freakin' story. What makes it interesting is that, even though Noah and Jude are telling two sides of the same tale, their perspectives are from different points in time. (The chapters alternate between Noah's point of view around age 14 and Jude's at age 16.)
That rift underscores the fact that we're peeping in on these formerly tight siblings at a time in their lives where they're sort of estranged.
Author Jandy Nelson has a whole bag of tricks that make Jude and Noah's voices super distinct. Noah cusses like a sailor where Jude self-censors, saying things like, "Okay, I effing noticed." (2.170)
Also, they each have their own affectations. Noah's always titling imaginary portraits of himself and others. So like, when his mom starts talking about art school, he creates "SELF-PORTRAIT: A Window Flies Open in My Chest." [1.92] Get it? He's excited.
Jude, on the other hand, is always having conversations with her dead grandma. Noah doesn't talk to Grandma Sweetwine. Ever. Just to his self-portraits.