The mangaer in Dororo is responsible for creating the visual and narrative aspects of the story. They shape the characters and plot through their artistic skills and storytelling abilities.
In Shark Boy and Lava Girl fanfiction, a prevalent theme is teamwork. Given their complementary abilities, they team up to face various challenges. The theme of good versus evil also shows up a lot. They are usually the heroes fighting against some form of evil, whether it be a villain or a natural disaster. And the theme of exploration is common too. They explore new lands or underwater worlds in many of the stories.
A common theme is friendship. Dororo and Hyakkimaru's bond is often explored further in fanfics. Another theme is redemption. Since many of the characters in the original have complex pasts, fanfics may delve into how they seek redemption for their actions.
The Dororo manga has a rather complex and bittersweet ending. Dororo and Hyakkimaru's fates are intertwined in a way that leaves a lasting impression on readers.