Osana Najimi might also be a popular character. She can be involved in the fanfiction as a friend or foe to Midori. If the story is set in the school environment typical of Yandere Dev's work, Osana could play a significant role in the power struggles or relationship dynamics. Additionally, Info - chan could be included. She has her own mysterious nature, and her interactions with Midori could be full of intrigue and mystery.
The main character is usually a young girl. She's often kind - hearted, a bit clumsy perhaps, and has big dreams. Then there's the male lead, who can be the cool and mysterious type, or the popular guy at school. There are also the best friends of the main girl, who are there to give advice, share secrets and sometimes cause a bit of drama.
As we don't have details about this particular 'akuma shoujo web novel', the main characters could include the akuma shoujo, of course. There may be a mentor figure who helps her understand and control her powers. And perhaps there are antagonists, such as other devil - related beings who want to use her for their own evil purposes or those who simply want to destroy her because they see her as a threat to the normal order.
I'm not sure as the title doesn't give much away about the characters. But it could be a couple who are not the typical shoujo characters, like two misfits.
The main character is usually a girl who loves literature. There might also be her friends in the literary club, like a boy who is also interested in books and helps her in her literary pursuits.
Some of the main characters include Hisao Nakai, a boy who has a heart condition. There's also Shizune Hakamichi, a deaf student. Emi Ibarazaki, an energetic runner with prosthetic legs is also a main character.