They can be classified by their origin. There are Earth - born characters, and those from other planets or dimensions. Also, characters can be grouped according to their abilities, like telepathic characters or those with super strength.
We can classify them based on their roles. For example, the protagonists who drive the story forward, and the antagonists who create conflict.
One way to classify is by their moral stance. There are the morally upright characters who fight for justice, the morally ambiguous ones who might switch sides depending on the situation, and the clearly evil characters. Another classification could be by their social status in the science - fiction world, whether they are leaders, outcasts, or ordinary citizens.
Classification of characters in crime fiction can be done in multiple ways. Firstly, according to their function, we have the solver (detective), the doer (criminal), and the sufferer (victim). Secondly, in terms of character traits, we can have the intelligent detective, the cunning criminal, and the vulnerable victim. Also, some characters can be grouped by their relationship to the main plot. For instance, there could be peripheral characters who are only loosely connected to the main crime but still play a part in the overall story.
Classification of characters in fiction stories can be done in multiple ways. Firstly, according to their function, such as the catalyst character who sets the events in motion. Then, by their emotional depth. Some characters are deeply emotional and complex, while others are more simplistic. And we can also classify them by their relationship to the central conflict. Are they directly involved in it, like the main combatants, or are they on the periphery, influencing the situation in a more indirect way?
We can classify them by their source. For example, some magic comes from within the magic - user, like an inborn power. Others come from external sources such as magical artifacts or places. Another way is by the effect they produce. Magic that heals is different from magic that destroys.
We can classify them based on the method. For example, mechanical time travel using devices like time machines. Another way is by the direction, whether it's forward or backward in time. Also, we can classify according to the purpose. Is it for adventure, like in 'Doctor Who'? Or is it to fix something in the past?
One way is by their role in the story. Those who drive the plot forward are important. Another way is by their personality traits. For example, introverted or extroverted characters. Also, by their moral standing, like good or bad characters.
One way is by their role in the story. As I mentioned before, protagonists and antagonists are big categories. Another way is by their personality traits. Are they brave, cowardly, kind - hearted, or cruel? We can also classify them based on their development in the story. Dynamic characters change, while static ones don't. For instance, in 'The Great Gatsby', Gatsby is a complex character. His role as a protagonist is clear, his personality is a mix of romantic and naive, and he is a somewhat static character in that his dreams don't really change even as the world around him does.
One type is the scientist character. They are usually intelligent and curious, driving the scientific exploration in the story. Another type is the alien. Aliens can have diverse forms and behaviors, some friendly like E.T., and some hostile. There are also the post - human characters, which might be genetically enhanced or cyborgs with a mix of human and machine parts.
Another way is by the target audience. Some romance novels are aimed at young adults and tend to have simpler storylines and more innocent love. These can be considered a lower level in terms of complexity. For adults, there are more complex levels with deeper themes and more mature relationships. There are also some romance novels that are specifically for older readers, which might deal with second chances at love or more complex family situations.
You can classify fiction books based on genre, like fantasy, mystery, romance, or science fiction.
The classification of fiction in DDC often depends on various factors like genre, themes, and intended audience. Different types of fiction are grouped into specific categories based on these aspects.