Definitely not. Batman is primarily a comic book hero. Novels don't feature his story. Instead, his exploits are brought to life through comics and their adaptations in different visual mediums.
In many Batman fanfictions when you learn, it might involve learning a secret about a sidekick's past or uncovering a conspiracy within Gotham City. Sometimes, it could be a personal revelation for Batman himself that shapes his actions going forward.
Well, fireworks can be used as a symbol. For example, in a fanfiction, every time Batman has a major victory, the people of Gotham set off fireworks. It becomes a sign of hope. Or, a new villain could create fireworks that are actually small bombs disguised as regular ones. Batman has to quickly learn to tell the difference to stop the villain's attacks.
Water margin is a novel that praises the righteous thief. In the novel, heroes such as Lin Chong, Wu Song, and Lu Zhishen were seen as righteous thieves who fought against corrupt officials to protect the people and fight for justice. Although their actions may be immoral, their purpose is to save society and benefit the people, so they are praised as heroes. This theme was very common in Chinese literature as a symbol of promoting justice and resisting evil.
Sure. There may be fanfiction where Batman has to deal with an insect - based threat in Gotham. It could be that a mad scientist has created giant mutant insects and Batman has to use his detective skills and gadgets to stop them. This would focus on the superhero aspect rather than any inappropriate themes.
Perhaps it could be about Batman's influence on the city's infrastructure and culture. His presence and efforts could 'impregnate' the city with new safety measures, new community programs, and a new sense of unity. The fanfic could detail how Batman's work leads to long - term positive changes in Gotham, from better schools to improved neighborhood relations.