One possible fanfiction could be that they are brothers separated at birth. Megatron is raised in a harsher part of Cybertron, which shapes his more aggressive views, while Optimus Prime is raised in a more diplomatic environment. Their reunion could be a turning point for the entire Cybertronian civilization.
In a fanfiction where they unite, it could start with a common threat that neither side can face alone. For example, an alien race invades Cybertron. Megatron and Optimus Prime realize that their brotherly bond is stronger than their differences. Together, they could form a new strategy, using both Autobot and Decepticon forces in a coordinated way to repel the invaders.
I'm not an expert in anime or movies, and I don't have enough information to answer this question. However, according to what I know about the Transformers plot, the scene of the fight between Prime and Megatron on the moon is not a plot of an anime or movie, but a plot of a Transformers comic or novel. In the Transformers comics and novels, Prime and Megatron often fought on different planets, some of which even involved the moon.
Optimus Prime is shown as extremely powerful in comics. His strength lies not just in his physical might but also in his leadership and determination. He can overcome seemingly impossible odds and lead his team to victory.
Optimus Prime is extremely powerful in the comics. His strength is shown through his ability to battle against powerful Decepticons and protect Earth. He has advanced weaponry and a never-give-up attitude that makes him a formidable character.
First, you need to understand Optimus Prime's character. He is a noble leader, so make sure his actions and decisions reflect that. For example, he would always put the safety of his team and the greater good first. Then, come up with an interesting plot. Maybe it could be about a new Decepticon threat or a journey to a mysterious planet. Also, include some great action scenes like epic battles between the Autobots and Decepticons.
One possibility could be that Optimus Prime is on a mission in a magical realm. There, he discovers an ancient power that forces his transformation into a dragon. As a dragon, he has enhanced firepower and flight capabilities. His dragon form might have a metallic sheen, like his original form, and his Autobot symbols could be incorporated into the dragon's scales. This new form could help him defeat the powerful enemies in this strange new world.
Perhaps a fanfiction where Arcee has to save Optimus Prime from a mind - controlling device. She has to fight against his altered self and find a way to break the control. This would show her determination and loyalty to Optimus.