I don't know as I haven't read the book.
Since I haven't read the book, I can't say for sure. But they could be the lost boys and girls themselves, with each having their own distinct personalities and backstories.
Since I'm not familiar with the book, the main characters could be various family members with different personalities and roles. There might be a rebellious teen who has run away from home, causing the family to be 'lost' in a sense, and the other family members are trying to bring this character back and restore the family harmony.
There is Conway, who is one of the central characters. He plays a crucial role in the discovery and exploration of Shangri - La.
The main character is, of course, the lost boy. He is the focus of the story. There could be a antagonist as well, perhaps someone or something that is preventing him from achieving his goal, whether it's getting home or finding what he's looking for. And then there may be supporting characters such as the people in the village or town where he ends up, who either help or hinder his progress.
I don't know for sure as I haven't read the book. It could be a young protagonist who is leading the group of lost ones, someone with a strong will and a sense of purpose.
One of the main characters is Professor George Edward Challenger. He is a brilliant but eccentric scientist who leads the expedition to the Lost World. Another important character is Lord John Roxton, a big - game hunter with great courage and skills. And there is also Professor Summerlee, who initially doubts Challenger's claims but later joins the adventure.
I don't know as there is not enough information. It could be a group of girls with different personalities.
There might also be a character who is trying to find the lost bookshop. This could be someone who has a personal or emotional attachment to the place, like a person who used to work there or had a life - changing experience in the bookshop.
Perhaps there is also an antagonist, like an evil sorcerer or a power - hungry noble who wants to keep the prince lost or even harm him to gain control of the kingdom.
I'm not sure as I haven't read the novel. But they could be the members of the lost family, like a lost child, a parent searching for their offspring, or siblings separated from each other.