One common theme is family loyalty. Given the strong bond within the Kamado family in the original story, this is often explored further in fanfiction. Another theme could be redemption, especially when it comes to Nezuko's situation as a demon. Writers might also focus on the theme of survival, as the family has to deal with the constant threat of demons.
Demon Kamado family fanfiction can be really exciting. It could focus on the untold stories of the Kamado family. Maybe there are stories about their ancestors and how certain family traits were passed down. Some fanfictions might also create alternate universes where the family has different powers or face different types of demons. It gives fans a chance to expand on the original story and get creative with the characters and their relationships.
The theoretical basis of the influence of a novel on another novel usually refers to the positive or negative influence of the novel on the creation of another novel, or the act of borrowing or plagiarizing a plot, character, theme, etc. of the novel from another novel.
Generally speaking, the theoretical basis for the influence of XXX novels on XXX novels could be described from the following aspects:
1. Plot influence: A plot or scene of a novel is borrowed or copied by another novel to become the plot or scene of another novel. For example, the image of Lin Daiyu in 'Dream of the Red Chamber' had been copied by many modern novels.
2. Character influence: The character in a novel is borrowed or copied by another novel to become a character in another novel. For example, the image of Song Jiang in Water Margins had been copied by many modern novels.
3. Thematic influence: A certain theme of a novel has been borrowed or plagiarized by another novel to become the theme of another novel. For example, the theme of Journey to the West was borrowed and plagiarized by many modern novels to become one of the modern novel's theme.
4. Style influence: The style of a novel is borrowed or copied by another novel. For example, the description of Water Margins had been copied by many modern novels and became one of the descriptions of modern novels.
To sum up, the theoretical basis of the influence of a novel on another novel refers to the positive or negative influence of a novel on another novel, or the act of borrowing or plagiarizing a plot, character, theme, etc. of another novel.
Nezuko is initially 12 years old in the manga. As the story unfolds, her age doesn't change significantly in a traditional sense, but her character development is quite remarkable.