Lois Lane is a must - include. She can be the love interest and also a strong - willed journalist. Jimmy Olsen is also great, providing some comical relief and being Superman's friend. Lex Luthor is an obvious choice as the main villain, always plotting against Superman.
One idea could be having Superman face an enemy that can manipulate time, causing chaos in Metropolis. Another could be a story where he has to deal with a powerful alien artifact that is affecting his powers. Maybe also a plot where he teams up with a new superhero from another planet.
Superman, of course, is the most important. Then there's Lois Lane, the journalist who is always on the hunt for a story and has a special relationship with Superman. Lex Luthor is also crucial as the main antagonist.
In the 'The Adventures of Superman Novel', a significant plotline is Superman's origin story. How he came from Krypton and was raised on Earth. His discovery of his powers and how he decides to use them for the greater good. Also, his relationships with Lois Lane and other characters in Metropolis play a big part in the plotlines as he tries to balance his personal life with his superhero duties.
Obviously, Superman himself is the most important. He is the hero with superpowers. And Lois Lane is also important as she is often in the middle of the stories and has a relationship with Superman.
One main theme could be heroism. Superman is always saving the day, which shows the importance of having heroes. Another might be justice as he fights against evil to bring fairness.
Their relationship might develop through shared experiences. For example, when they are both investigating a mystery in Metropolis. Clark uses his super - powers subtly to help Lois get to the bottom of the story, and in the process, they grow closer. As they face danger together, they start to rely on each other more and more, which deepens their connection.
One example could be a story where a female Clark fan uses her admiration for him to inspire others in Metropolis. She might start a movement of positive change, like promoting Clark's values of truth and justice on a grassroots level. This could involve her writing articles or giving speeches about the symbol that Superman represents.
One interesting plot could be Clark and Lois working together to expose a conspiracy in Gotham that involves both Superman and Batman. Maybe they discover that a powerful criminal organization is trying to pit the two heroes against each other for their own gain. They use Lois' investigative skills and Clark's powers to gather evidence and try to bring peace between the two vigilantes.
The female character can be developed by giving her a backstory related to Clark. For instance, if she grew up in a rough part of Metropolis and Superman's actions made her believe in hope, that could shape her personality. She could be strong - willed and determined to support Clark in any way she can.