One common theme is family. Since they are brothers, a lot of fanfictions explore their family dynamic further, like how they support each other through tough times. Another theme is growing up in their unique neighborhood. They face different challenges and the fanfictions often show how they deal with them together or separately.
Yes, there are quite a few out there. You can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'The Boondocks Riley x Huey' and you'll likely find a variety of stories with different takes on their relationship, whether it's a more brotherly bond exploration or some creative scenarios set within the world of The Boondocks.
One common theme could be friendship. They might start as friends and then develop a deeper connection. Another could be adventure, where they go on some sort of journey together.
I'm not sure specifically which Riley x Cindy fanfic stories are out there. You could try searching on fanfiction websites like Archive of Our Own or FanFiction.net. They usually have a wide variety of fan - created stories.
One idea could be that they work together on a really tough case that has personal implications for both of them. As they dig deeper into the case, they start to rely on each other more and more, and a romantic relationship begins to develop.
Huey Newton's story is one of activism and fighting for social justice. He was a key figure in the Black Panther Party and his experiences were filled with challenges and efforts to bring about change.
There may not be a large number of novels directly named as 'classic Huey long novels' in a very common sense. But if we consider works that explore the political and social context of his era, they could potentially be related. For example, some novels about the power struggles, corruption, and social change in Louisiana during his time could be considered relevant, though not strictly a 'Huey Long novel' in the title.