In the fanfic, their older brother might be a bit of a rebel. He could have left the X - Men for a while due to some ideological differences. But then, when Scott and Alex find themselves in a really tough situation, he comes back to help. He brings with him some new fighting techniques he learned during his time away, and together they form a stronger team.
One common theme is brotherhood. Given their relation, many fanfics explore how their bond as brothers is strengthened or tested in different situations within the X - Men world.
One possible fanfic could be about Scott and Alex's journey in the X - Men world. Maybe they discover new powers together. For example, Scott's optic blasts could combine with Alex's energy manipulation in a unique way during a battle against a powerful mutant enemy.
Scott could be the leader - like figure among them, using his optic blasts to protect his brothers and the X - Men. Alex, with his powerful energy blasts, might be the more impulsive one who often rushes into danger. Their older brother could be the strategist, coming up with plans to outwit the enemies.
There's 'Scott and Alex: A New Beginning' which focuses on a fresh take on their characters. In this fanfic, they face new challenges within the X - Men that really test their loyalty to each other and the team. It's a really interesting read.
It could include their training sessions at the X - Men school. They would learn from the experienced mutants like Professor X and Wolverine. Their powers would be refined, and they'd form bonds with other students.
One possible fanfic could be about Scott and Peter becoming unlikely friends. They might start off with some misunderstandings due to their different powers and personalities. Scott, with his optic blasts, is more reserved and serious, while Peter, with his super - speed, is more carefree. But as they face a common enemy in the X - Men universe, they learn to work together and respect each other's abilities. This could lead to some great adventures and a deeper bond between them.
One idea could be Scott dealing with his powers evolving in a new and unexpected way. Maybe he starts to see new wavelengths of light that he has to learn to control, which could lead to some really cool action scenes and internal struggles as he tries to master this new aspect of his powers.
There could be many interesting fanfics about them. One possibility is that Scott, with his optic blasts, teams up with Peter (Quicksilver) and Parker (I assume you might mean Peter Parker from Spider - Man in a crossover - like scenario in the X - Men universe). They could be on a mission to stop a powerful mutant villain who is threatening the world. Scott's leadership skills, Peter's super speed, and Parker's web - slinging and spider - sense would make for an exciting combination.
Scott Xavier is a really interesting character in X - Men fanfic. He often combines the traits of both Scott Summers (Cyclops) and Professor Xavier. In many fanfics, his character is developed to show a new side of leadership. He might have different relationships with other X - Men members compared to the original comics or movies. For example, his friendship or rivalry with Wolverine could be explored in unique ways. Also, his powers and how he uses them in different scenarios can be a major focus in the fanfic.