I think that a lot of popular Young Adult books have that “outsider” theme. I certainly related to them because I also felt like one, which I think is part of the reason why they are so popular. A lot of “outsider” kids usually turn to books to escape their world.
I agree that Katniss Everdeen certainly fits into that category, especially in Catching Fire. You can clearly see that during the Victory Tour of the Districts (more pronounced in “career” ones), but especially when she can Peeta go to the party at President Snow’s mansion and see all the food, and attitude of Capitol people. How they can overindulge when food can be scarce in District 12 and some of it is such a luxury?
No one can deny that Harry Potter fits the role of an outsider as well. Harry Potter and the Goblet of Fire is one of my favorite books of the series and I think that it is in this one, and maybe perhaps in Chamber of Secrets that shows that even if Harry is a wizard among wizards, he is still a bit of an outsider, not only because of his fame, his ability to speak Parseltongue (in CoS), but being chosen as a younger, immature and less knowledgeable champion in Goblet of Fire. I think that this excerpt from Goblet of Fire really shows that “outsider” perspective:
Viktor Krum, Cedric Diggory, and Fleur Delacour were grouped around the fire. They looked strangely impressive, silhouetted against the flames.
Another person is Tris from Divergent series, but I think that technically that could be applied to anyone who moves from one Faction to another, but Tris is our protagonist. Even though she knows what is going on in other Factions, a little bit at least, she is still lost like some of her peers when they start their training in Dauntless
, especially more so when it is revealed that she is Divergent, a person that fits into more than one Faction and strays away from the established norm