The plot involves the struggle between mutants and humans reaching a critical point. There are battles over the 'cure' for mutation. Some mutants see it as a threat to their kind while others welcome it. Magneto, as always, is on the side of mutants' freedom and is ready to fight against those who would enforce the cure. The X - Men are divided in their views as well, with some trying to find a middle ground.
Well, the main characters in 'X Men The Last Stand Novel' are quite diverse. First, there's Magneto. His character is strong - willed and he's a fierce defender of mutants. He'll do anything to protect their existence. Then there's Professor X. He's not just a powerful telepath but also a wise leader for the X - Men. He hopes for peace between mutants and humans. Wolverine is a key player too. His unique abilities and his somewhat solitary nature add depth to the story. And Rogue, with her power that both isolates and gives her an edge, is an essential part of the narrative as well.
One idea could be exploring the backstories of the minor characters in more depth. For example, what was the life of that one mutant who had a brief appearance in the movie like before they came to Xavier's school? Another could be a different ending where the mutants find a more peaceful co - existence solution instead of the chaos in the actual movie.
Logan (Wolverine) is definitely one of the most popular. His complex past and his brooding nature make him a great character to explore further. Another is Jean Grey. Her transformation into the Phoenix and the internal struggle she faced are rich areas for fanfiction writers to dig into. Magneto is also a favorite. His extreme views on mutant - human relations and his powerful abilities can be used to create interesting plotlines.
The 'X - Force' storylines involving Apocalypse are really good. They show a more violent and action - packed side of the fight against Apocalypse. The X - Force, a more militant group of mutants, uses their unique skills and powers to take on Apocalypse and his minions. It's a story that doesn't shy away from showing the darker aspects of the X - Men universe.