It's really hard to tell without reading it. However, in fanfiction, it's common for the main characters to be borrowed from the original work it's based on. So perhaps it features the main hero or anti - hero from the source material who is now being explored in a more in - depth, darker context.
Since I haven't read it, I can't say for sure. But it could be the protagonist who has this 'dark heart' that the title refers to.
The main character is Marlow. He's the one who embarks on the journey into the Congo. His perspective shapes the whole story. Kurtz is the most talked - about character. He's a man who has lost his way in the jungle, succumbing to the power and madness there. There are also the unnamed European managers and clerks. They are part of the machinery of imperialism, and their actions and attitudes help to show the nature of the colonial enterprise in the Congo.
The main character is Marlow. He is the narrator of the story and his journey into the Congo forms the core of the novel. Kurtz is another important character. He is a man who has become a sort of demi - god in the Congo, representing the extreme of what European influence can become in the African context.
In the 'Heart of Darkness' full story, there are two central characters. Marlow, who is an introspective seaman. He is our guide through the story, sharing his experiences and thoughts as he travels deeper into Africa. Then there is Kurtz. Kurtz is a complex character who has succumbed to the dark side of colonial power. He has become a sort of demi - god among the natives in the Congo, but his actions are morally corrupt. These two characters are crucial for understanding the story's exploration of human nature and colonialism.
Marlow is the central figure in Heart of Darkness. He's a seaman who is sent to the Congo to retrieve Kurtz. Kurtz, on the other hand, is this mysterious and somewhat infamous figure. He has created his own little 'empire' in the jungle and has lost his moral compass. There are also some other minor characters like the Manager, who is in charge of the trading post in the Congo, and the natives, who are often the victims of the colonizers' actions.
I'm not sure as I haven't read it. But it could be the typical heroes and heroines you often find in fanfiction. They might be original characters created for this story, or well - known characters from the source material if it's a fanfic based on something else.
There might be a wise old mentor figure who guides the main character in their quest to understand the root of the darkness. This character could have past experiences related to the darkness and pass on their wisdom to the protagonist.
Typically, in 'whispering darkness fanfiction', there could be a hero - type character. This character is often the center of the story and is on a journey to uncover the secrets of the 'whispering darkness'. Then there might be an antagonist, a force or person who wants to use the 'whispering darkness' for their own evil purposes. And there may be supporting characters like the hero's friends or family who are affected by the hero's involvement with the 'whispering darkness'.
In some 'darkness is magic' fanfictions, there could be a group of characters who are all affected by the presence of dark magic in different ways. One might be a healer who tries to counter the negative effects of dark magic, another could be a thief who uses dark magic for stealth and thievery. These diverse characters would interact and their stories would unfold, with the theme of dark magic binding them all together.
There could also be an antagonist, someone who opposes the goals of the main character. This character might be driven by power, greed or some other negative motives and creates conflict for the protagonist.
In some 'depths of darkness fanfiction', there could be a group of companions. They each have their own unique skills, such as one being a great archer, another a skilled healer, and they all work together with the hero to overcome the obstacles. Their different personalities and abilities create interesting dynamics within the story as they bicker, support each other, and grow together throughout their adventures.