Survival is also a common theme in island - based novels. The characters may have to fight against nature, find food and shelter, and deal with various challenges. Another theme might be the exploration of human nature. In a confined space like an island, people's true selves may be revealed, whether it's their good or bad sides. In some cases, there could be a theme of mystery, perhaps there are secrets hidden on the island that the characters need to uncover.
There are several potential themes. Firstly, the relationship between man and nature is often explored in island - based novels. How do the characters adapt to the island's environment? Do they respect it or try to conquer it? Secondly, there could be a theme of community. If there are multiple characters on the island, they may form a community, and issues like leadership, cooperation, and conflict within the community can be important themes. Also, themes of hope and despair can play a role. The characters may experience both as they struggle on the island, hoping for rescue while facing difficult situations.
One possible theme could be isolation. Since it's an island, the characters are likely to be cut off from the outside world, leading to feelings of loneliness and self - discovery.