Another theme is the exploration of the nature of angels. This can include their powers, their origin, and their relationship with humans. For example, some books might explore whether angels have free will or are bound by a higher power.
A common theme is the battle between good and evil. Angels are often seen as the representatives of good, so in these books, they usually fight against demons or other forces of darkness.
The theme of prophecy related to angels is quite common. Angels are often seen as bringers of prophecies in these novels, which drive the plot forward. The concept of angelic intervention in human affairs is another theme. Whether it's to save humanity from a great disaster or to influence historical events, angels play a crucial role in the narrative. And, of course, the theme of redemption is also present, as angels are sometimes portrayed as agents of salvation or as beings who can help humans find redemption.
The 'Maximum Ride' series by James Patterson has elements of angelology in it. The story features characters with angel - like abilities and it's a very exciting adventure series that also touches on themes related to good and evil, which are often associated with angelology.
Power struggles are common. In historical fiction, we often see characters vying for power, whether it's political power like in 'A Game of Thrones' (although it's a fictionalized version of a historical - like setting). Cultural clashes are another theme. When different cultures meet, as in books about the colonization era, it creates interesting storylines. And of course, the theme of survival. Characters in historical fictions have to survive in difficult times, like the early settlers in America as portrayed in some books.
One common theme is mental illness. Often, the characters in these books are dealing with depression, anxiety or other psychological disorders that contribute to their suicidal thoughts. For example, in 'The Bell Jar', Esther Greenwood's struggle with depression is a central aspect.
One common theme is survival. Characters in these books are often faced with the harsh reality of a world that has been greatly damaged or where most life has ended. They have to find ways to stay alive, like in 'The Road' where the father and son struggle for basic necessities.
Love is a very common theme. It can be romantic love between characters, like in 'Pride and Prejudice'. Another common theme is the struggle for power, as seen in 'Game of Thrones'. Also, the theme of self - discovery is quite frequent, where characters learn about themselves and their place in the world, for example in 'The Alchemist'.
One common theme is the struggle for survival. When a character is kidnapped, they have to find ways to endure the situation, like in 'Room'. Another theme is the search for truth. In books like 'Gone Girl', the truth about the so - called kidnapping is much more complex than it first appears. Also, the theme of redemption can be found. For example, in some stories, the kidnapper might have a past that led them to this act, and there could be a journey towards redemption.
One common theme is the struggle against nature. For example, in 'The Old Man and the Sea', the old man battles the sea and the big fish. Another theme is human resilience. In 'Unbroken', the protagonist endures so much in the war and in the face of nature's hardships. Also, self - discovery is often a theme. As in 'Wild', the woman on her journey of survival also discovers a lot about herself.
One common theme is power and control. The kidnapper often tries to exert control over the victim, like in 'The Collector'. Another theme is the psychological impact on the victim and sometimes the kidnapper too. In 'Room', we see how the mother and son deal with the trauma of being held captive.
One common theme is the search for self - knowledge. Since the characters are reborn, they often try to understand who they are across different lifetimes. Another theme is redemption. They might have made mistakes in past lives and are seeking to make amends in the new ones.