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.
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.
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.
When writing, focus on the relationships between the characters. For instance, show how the OC's older half - brother interacts with Scott. Are they friends or rivals? You can also include some dialogue to make the story more engaging. For example, Gabriel could say something funny to break the ice when there is tension between the characters. Also, describe the settings vividly so that the readers can picture the story in their minds.
There might be a fanfic where the relationships between them are explored. For example, the OC's older half - brother could have a conflict with Scott at first because they have different views on how to handle a certain situation. But as the story progresses, they learn to understand each other. Alex and Gabriel could be the mediators in this situation, trying to keep the peace between the two.
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.
In this fanfic, the relationship between Scott, Alex, Gabriel and the OC as the fourth brother could be explored in depth. It might start with the OC being an outsider, not fully accepted by the others at first. But as time goes on, through shared experiences like defending their village from invaders, they come to realize his value and he becomes an integral part of their brotherly bond. Their individual personalities would also play a role in how they interact. For example, Scott's impulsiveness might sometimes clash with Alex's more cautious nature, while Gabriel tries to keep the peace, and the OC brings a fresh perspective to their group dynamics.
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.
One idea is a fanfic where Scott and Peter swap powers for a day. This would lead to some hilarious and challenging situations. Scott would be running around at super - speed, trying to control it, while Peter would be dealing with the power of the optic blasts. They would learn a lot about each other's powers and how difficult it can be to master them. It could also be a story about empathy and understanding between the two characters.