I'm not sure exactly as I haven't read it fully, but surely the daughter of the emperor is a main character. There might also be her family members like the emperor himself, the empress, and perhaps her siblings.
Well, aside from the obvious daughter of the emperor, there could be some important court officials or nobles who play significant roles. They might be friends, foes, or mentors to the daughter. For example, an old and wise advisor who helps her understand the ways of the court, or a young and ambitious noble who tries to use her for his own gain.
The main characters could also include servants or guards who are close to the daughter of the emperor. They might provide a different perspective on the imperial life. Maybe a loyal maid who has been with her since childhood and knows all her secrets, or a brave guard who is secretly in love with her and would do anything to protect her.
The protagonist is of course one of the main characters. He has a strong will and the determination to rise to the top in the demonic world.
I don't know for sure as I haven't read it. But likely there would be the emperor as one of the main characters. There might also be a female lead, perhaps a court lady or a commoner who somehow gets involved with the emperor. Maybe there are also some eunuchs or court ministers who play important roles in the story.
Given the title, the main focus would be on the level 99 villainous daughter. But in a web novel, there are usually multiple characters to support the story. There may be her family members who play a role in her becoming a villain or trying to stop her. There could be friends or followers she has, who either support her villainous deeds wholeheartedly or are just using her for their own gain. Additionally, there may be characters from the 'good side' who are constantly trying to thwart her plans and bring her to justice.
The main character is the daughter of the emperor, of course. There may also be other important characters like the emperor himself, her mother if she is in the story, and perhaps some court officials or servants who play significant roles in her life.
The main character in 'I became the emperor's daughter one day novel' is the girl who enters the imperial world as the emperor's daughter. The emperor is a crucial character as his actions and decisions will greatly impact the main character's life. There could be a eunuch who serves as a confidant or informant for the main character, helping her understand the ins and outs of the court. Also, there may be a noble lady who becomes the main character's rival, vying for the emperor's attention or trying to undermine her new position in the imperial family.
The characters included: The female lead was Ye Qi, the Eldest Princess of Yan Country. The male lead was Gu Ziqing, the son of the Grand Tutor. He became the Prime Minister. The male lead was Wen Guyuan, the son of Marquis Wenzhao. The princess's son-in-law. The male lead was Ye Wei, the Fourth Prince of Yan Country. The male lead was Lin Jingxun, the son of the General of the State of Wei. The male lead was Lin Xuan, the son of Prince Lin. The male lead was Xu Yun, the former Shadow Guard, the Eldest Princess's guard. The male lead was Song Qiu, a scholar from a poor family, a storyteller. The male lead was Jiang Qi, the Crown Prince of Jiang Country. He was proud and aloof. The male lead was Zhao Jinyan. Student of the Imperial Academy of Medicine, male supporting role-Zhao Jinran, owner of Jade Man Pavilion, male supporting role-Ye Ze, Third Prince of Yan Country, male supporting role-Ye Hui, Second Prince of Yan Country, male supporting role-Ye Ling, First Prince of Yan Country, male supporting role-Ye Qiong, Monarch of Yan Country, male supporting role-Feng Zhe, General of Yan Country, male supporting role-Helian Che, Grand Lord of Rong Clan, male supporting role-Yan Yue, grandson of the fallen emperor, music officer of Yan Country, female supporting role-Ye Wan, Second Princess of Yan Country, female supporting role-Zi Yan, talented woman who could topple a country, Jianghu killer, female supporting role-An Yu, daughter of Imperial Physician An. Female supporting role-Bai Zhi, the only daughter of General Bai. Female supporting role-Murong Ling, the princess of the State of Wei (a fallen country), Consort Chen of the State of Yan. Female supporting role-Cheng Jinglian, the Consort of the State of Yan, the mother of the Third Prince Ye Ze. "The Emperor's Daughter Becomes an Emperor" by Tao Qi. It was an ancient romance/classical fictional novel. The eldest princess of Yan Country, Ye Qi, witnessed her mother, Consort Chen, die tragically under her father's sword when she was twelve years old. However, Concubine Chen's death was only the beginning of a huge conspiracy. Ye Qi left the palace in anger and went to the wilderness to mourn for Consort Chen. Three years later, the princess returned and the wind and clouds rose again. I hope you will like this book.
In the 'kinnporsche web novel', the two central characters are Kinn and Porsche. Kinn is likely to be in a powerful position, while Porsche has his own distinct personality and role. They are the focus of the story, and their actions and interactions drive the plot forward.
Perhaps there is a young, idealistic lawyer who is the central figure in the 'justice web novel'. This character might face a lot of challenges in the courtroom while trying to uphold justice. There could also be some supporting characters like a wise old mentor who guides the lawyer in his journey for justice. And then there could be the antagonists, like corrupt officials or criminals who try to undermine justice.
I'm not sure who the main characters are in 'arachne web novel' as I haven't read it. But if it's named after Arachne, she is likely to be a main character.
I don't know as I haven't read it. There could be a character named Shiraori as the main one, or it could be an ensemble cast.