The theme of social class differences could also be significant. There may be barriers or tensions between characters from different social strata. This could influence their relationships, decisions, and the overall direction of the story.
Well, it could be centered around the idea of finding beauty or hope within the darkness. Maybe the waltz represents a form of escape or a way to cope with the hardships that the characters face in the story. It might also deal with themes of secrets and revelations that occur while in this state of 'darkness'.
I'm not sure as I haven't read the novel specifically. But usually, in a novel like this, there would be a protagonist who is likely to be the one most affected by the 'darkness' and who has to waltz through it. There might also be a love interest or a mentor figure to help or complicate the protagonist's journey.
I'm not entirely sure as I haven't read the specific 'waltz into darkness novel' in detail. But usually, the protagonist is an important character. He or she is likely to drive the story forward, facing various challenges and making crucial decisions throughout the novel.
One of the main themes is war and its consequences. It shows how war affects the mental state of the soldiers.
One main theme is the trauma of war. It shows how soldiers carry the psychological scars long after the fighting has ended. Another is the loss of innocence, as the events of the war shatter the normalcy of the characters' lives.
One of the main themes is the corrupting nature of power. In the novel, the political system twists and distorts the characters' values. Another theme is the loss of individual freedom. The main character is trapped in a system that controls every aspect of his life. Also, the idea of betrayal is prominent, as characters turn on each other in the name of political ideology.
One of the main themes could be the struggle against the unknown in the darkness. It might also touch on themes of survival and the human spirit's resilience.
The themes include the exploration of good and evil. The setting in the Congo makes the characters face their own morality. Racism is also a theme. The Europeans in the novel often look down on the African natives, which reflects the prevalent racist attitudes of that time. And there is the theme of isolation. Marlow is isolated during his journey, both physically in the African wilderness and psychologically from the people around him, which makes him question his own values.
One of the main themes is adventure. The characters are constantly on quests and facing various challenges in a fantasy world. Another theme is friendship. Despite their differences, the characters like Kazuma, Aqua, Megumin and Darkness form a unique bond as they journey together.
Not having read 'The Darkness' makes it a guess, but many Icelandic novels explore themes like the power of the Icelandic landscape. It could be that in 'The Darkness', the harsh and unforgiving Icelandic environment plays a big role, perhaps representing the internal struggles of the characters. Also, themes of identity, both personal and cultural, are often explored in Icelandic literature, so that might be in there too.