What are some good points on social injustice in the book The Outsiders?

I have to do an English Assignment where I have to pick a person who is important to the social injustice theme, and write a speech in their words on how they relate to it and I have to present it appearing in character.

I chose to be Ponyboy Curtis from The Outsiders by S.E. Hinton, and I have picked out a few quotes and pieces from the book, and mentioned them, but I feel that it’s not enough..

Any ideas, suggestions, or anything else? Would be much appreciated!