What are some interesting ideas for an Optimus Prime crossover fanfiction?

One idea could be an Optimus Prime crossover with the Transformers: Beast Wars. Picture Optimus Prime interacting with the Maximals and Predacons, and how his leadership style might contrast or blend with that of Primal. Another could be a crossover with a superhero universe like the Avengers. Optimus Prime's sense of justice would fit well in that world, and he could team up with Iron Man to share technology or battle strategies.

In a different scenario, Voldemort could be in search of a powerful new weapon and discovers a way to control Optimus Prime. Harry and the Order of the Phoenix have to find a way to break the control and convince Optimus to join their side. They could use their combined powers of magic and technology to defeat Voldemort once and for all.

One idea could be a story where Optimus Prime has to team up with an unlikely ally from another planet. Maybe a small, scrappy alien that has some unique abilities that can help in the fight against the Decepticons. This would add an interesting dynamic as Optimus has to learn to work with a very different being.

A plot idea could be that Optimus Prime time - travels. He goes back to the beginning of the war between the Autobots and the Decepticons and tries to prevent it from starting. Along the way, he meets younger versions of his friends and enemies and has to deal with the consequences of changing the past. Or perhaps, Optimus is trapped in a dimension where the laws of physics are different. He has to adapt quickly and find a way back to his own world while also facing off against new threats.

Maybe a plot where Female Optimus Prime teams up with some human female scientists. They work together to develop a new energy source that can end the war with the Decepticons. Along the way, she learns about human emotions and relationships which influence her leadership style.

A plot could revolve around a young fan who writes a lemon - themed story about Optimus Prime. The story somehow comes to life and starts affecting the real Optimus Prime and his world. He has to then find a way to reverse the effects while also learning about the power of human creativity and how it can have unexpected consequences on their reality.

Perhaps a fanfiction where a powerful artifact is discovered that has the potential to change the balance of power on Cybertron. Megatron wants it for his own gain, and Optimus Prime wants to protect it. But when they both touch it simultaneously, they are transported to an alternate dimension where they must work together to find a way back, all while learning more about each other than they ever thought possible.

A really interesting plot could be set in an alternate universe where Bumblebee and Optimus Prime are not part of the Autobot - Decepticon war. Instead, they are explorers. They could encounter a strange new planet or a powerful ancient artifact that tests their relationship and their understanding of each other. This would be a great opportunity to explore their characters outside of the typical war - torn setting.

One plot idea could be that Optimus Prime and Starscream are forced to team up during a crisis that threatens both Autobots and Decepticons. They start to see each other in a new light and develop an unlikely friendship. Another could be a story where Starscream is injured and Optimus Prime has to make the choice between helping him or leaving him to the mercy of other Decepticons. This could lead to a complex relationship between them. A third idea is a time - travel plot where they end up in an alternate universe where their roles are reversed and they have to figure out how to get back to their own universe while dealing with their changed relationship.

There could be a fanfiction where a strange energy source affects Optimus Prime and Megatron, causing them to swap personalities or abilities. This would be a humorous yet also thought - provoking plot. They would have to navigate their new selves while still trying to lead their factions. The Autobots would be confused by an aggressive Optimus and the Decepticons would be equally bewildered by a more pacifist Megatron.