why did nezuko become a demon

Yes, she does. Nezuko eventually regains her humanity in the manga.

The reason Spray of Flowers turned into a demon in the Judicial Office's journal was because he was framed by the Minister of Justice and fed demon meat, causing him to become a half-human, half-demon monster. This plot was described in the journal of the Supreme Court.

In the Archean Eon Painting, Mei Ning had become a mental demon because her heart was occupied by darkness and hatred, and she could not extricate herself. In the novel, Mei Ning was a cultivator. She used to be a kind and pure girl, but in an accident, she lost her family and was controlled by an evil cultivator. During the process of being controlled, Mei Ning's heart was occupied by darkness and hatred. She began to hate humans and wanted to destroy the entire world. In order to get rid of the control of the inner demon, Mei Ning began a long journey of cultivation. In the process of cultivation, she encountered many difficulties and challenges, but she persevered and finally succeeded in getting rid of the control of the inner demon and became a powerful cultivator. While waiting for the TV series, he could also click on the link below to read the classic original work of " The Legend of Mortal Cultivation "!

There was no clear answer to the question of why Li Bing of the Supreme Court had become a demon. There were some speculations that Li Bing might have been enchanted or taken some kind of medicine, causing him to become a cat demon. In addition, there was also a saying that Li Bing's transformation was related to his father, but the details were not clear. In short, as for why Li Bing became a demon, he needed to watch the plot further to get the exact answer.

No, Nezuko didn't die in the manga. She played a crucial role throughout the story.

Nezuko remains alive in the Demon Slayer manga. The author chose to keep her alive as she is an important character with a vital part to play in the overall narrative.

In traditional Chinese culture, foxes were not always synonymous with fairies. Their original meaning was different from the current meaning. In ancient texts such as the Classic of Mountains and Seas, foxes were described as auspicious animals and were believed to bring good luck. Foxes were also known as "nine-tailed foxes" because nine-tailed foxes were considered very noble and sacred animals. There was a legend of "nine-tailed fox fairy". As time and culture changed, foxes gradually changed and became synonymous with fairies in some novels. This was because in the process of writing some novels, the author would portray the fox as a demon with different characteristics and attributes according to his own imagination and creative needs. The image of the demon may be different from the fox in traditional culture, but it was shaped according to his own imagination and creative needs.

Nezuko doesn't die in the manga. She survives and plays a crucial role throughout the story.

Definitely not. In the manga, there's no such plotline of Zenitsu and Nezuko getting married. Their relationship is more focused on being comrades in the fight against demons rather than a romantic one leading to marriage.

Yes, Ciel did become a demon in the manga.