I'm not sure specifically as there could be many different versions of such a visual novel. But generally, the main characters would be the girls who wear glasses. They would be the central focus of the story, with their own personalities, dreams and relationships.
Often, the main character is a young and ambitious pokemon trainer. They are curious and eager to explore the world of pokemon, and the discovery of the pokemon glasses sets them on a new adventure.
The character Felicity could be a complex anti - hero type. She might be someone who has been pushed to the edge by circumstances in the fanfiction world. The person with glasses could be a nerdy scientist type. They could be working on a project that Felicity believes is dangerous if it falls into the wrong hands, so she kidnaps them to either stop the project or control it herself.
The obvious main character would be the girl who experiences the wedgie and loses her glasses. There could also be a bully who gives her the wedgie in the first place. Maybe this bully later has a change of heart and helps her look for her glasses.
The girl without glasses is the central figure. There may be an antagonist like a school bully who constantly teases her about her wedgies and her glasses - free look. Then there could be a wise old janitor who gives her advice on how to deal with the bullies and how to embrace her new self. There might also be a group of girls who initially exclude her but later come to accept her as she shows her true character despite the physical changes.
The girl could be a young student who was abducted by bullies. The bullies tie her up, and during the process, her glasses are lost. A kind teacher or a fellow student who stands up to bullies could be the one to rescue her. They would then help her look for her glasses, which are important for her to see clearly in class.
The main character, a woman named Claire, who is a journalist. She lost her glasses during an interview. The kidnapper could be someone who wants to stop her from publishing a certain story. And there could be Claire's editor, Mark, who gets worried when she doesn't show up for work and starts looking for her. He could end up being an important part of the rescue operation.
There are many! For example, Daria from the animated series Daria. Her glasses are a key part of her cynical and sarcastic personality. And don't forget about Toph from Avatar: The Last Airbender. Her glasses help give her a unique and tough look.