What are five key quotations from Dill that help to develop the themes in the novel?
I can get you started with three quotes from Dill that are significant to the story's theme:
"I'm gonna stand in the middle of the ring and laugh at the folks." Here Dill is talking about being a clown. While it is merely Dill expressing frustration about his life, it is significant because he is pointing out the follies of others. Much of this story focuses on how humans view the world around them - perception becoming reality.
"I'm little but I'm old." Again, perception vs. reality. Dill is asserting that just because he is little doesn't mean that he doesn't understand many of the issues of the adults around him. Just because people are poor, or uneducated, or of a certain race, doesn't mean that their characteristics are limited to those details. People are diverse, and complex.
"They just wasn't interested in me." Dill is speaking of his parents, and his feeling that they didn't "see" him as an individual. The same happens to Boo Radley, to Tom Robinson, and even to Atticus. It relates to the idea that in order to understand someone, you have to step into their world.