Perhaps there are characters like young lovers who had their relationship develop during those summers. There might also be older residents who remember the 'good old days' of those summers and are now witnessing the changes. Or there could be outsiders who come to Newport during those summers and get involved in the local happenings.
I'm not sure exactly as I haven't read it. But it might be about some summers in Newport that were lost in a metaphorical sense, perhaps some memories, events or relationships that were special during those summers.
I'm not sure specifically as I haven't played it. But usually in such visual novels, there are characters like the protagonist, who is likely to be a young person. There might also be friends, family members, or love interests.
I'm not sure specifically, but it could be a young student who loves reading during summer break.
Without having read it, it's impossible to tell for sure. But my guess is that the main characters would be the people directly involved in the sixth wedding. Maybe there's a bride and groom who have a long history together over the 28 summers, and then there could be other characters like their parents or best friends who have been part of their journey and are part of this story.
Not having read the book, it's hard to say for sure. However, given the title, Shannon is clearly important. There could be a group of ladies in the book club who each have their own personalities and stories. Maybe there's a lady who is really into classic literature and another who loves contemporary novels. These different interests could lead to various interactions and plot developments within the story.
Often, the parents of the baby are main characters. They could be named characters from the original source material related to 'Summers' if it's a fanfic based on an existing franchise. For example, if it's related to the X - Men and the Summers family, Cyclops and Jean Grey might be the parents.
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.
I don't know as I haven't read the book.
There is Conway, who is one of the central characters. He plays a crucial role in the discovery and exploration of Shangri - La.