There's also 'The Flash and Quicksilver: A Race of Worlds'. This fanfic focuses on the two speedsters from different universes. They start off as rivals but then become friends as they face a threat that only their combined speed can defeat. It has some really cool scenes with their super - speed abilities.
The plot needs to be engaging. It could be a threat that forces the two universes to collide, like an all - powerful villain who can only be defeated by the combined forces of DC and Marvel heroes. This gives a reason for the crossover and keeps the readers hooked. For example, if there's a villain who can manipulate time across both universes, that would create a lot of interesting storylines.
First, you need to know the characters well from both universes. For Transformers, understand their personalities, like Optimus Prime's leadership and Bumblebee's loyalty. In DC, know the heroes' and villains' traits, such as Superman's strength and Lex Luthor's cunning. Then, come up with an interesting plot. It could be about a common threat that forces the Transformers and DC characters to team up. Maybe a new villain who can manipulate technology and magic is causing chaos in both worlds. Also, make sure to write good dialogue that fits each character.
One idea could be a crossover between Batman and Superman. Imagine a story where they have to team up against a new super - villain who has the power to manipulate time. Another could be a crossover with the Flash and Green Lantern, perhaps they get stuck in an alternate dimension and have to work together to find their way back.
First, know the characters well. For example, if you're bringing together Iron Man and Batman, understand their different motives and personalities. Iron Man is more flamboyant and tech - based, while Batman is a brooding detective. Second, create a compelling plot. Maybe a threat that neither universe can handle alone. Third, balance the power levels. Don't make one side too overpowered compared to the other.
In 'Transformers DC Crossover Fanfic', a common idea is a technology - magic mashup. Since Transformers are all about advanced technology and DC has a lot of magic - based characters like Zatanna. The story could be about how they combine their powers to defeat a new type of enemy that is immune to normal attacks. Also, a rescue mission where the Autobots and DC heroes team up to save hostages in a dangerous location is quite popular. And then there's the idea of a shared enemy that is a hybrid of a Decepticon and a DC villain, like a fusion of Shockwave and Brainiac who plans to conquer both universes.
One idea could be a story where the Avengers and the Justice League team up to fight a common enemy like Darkseid and Thanos working together. Another could be a character - swap scenario, for example, Superman being in the Marvel universe and having to deal with the likes of Doctor Doom. Maybe a story where Batman uses his detective skills to solve a mystery in the Marvel world that involves Hydra.
Batman and Robin is a classic pairing. It's not just a superhero - sidekick relationship but also has a deep emotional bond. Their crossovers often explore Robin's growth under Batman's tutelage and how they handle different threats together.
Another idea is a crossover where Deadpool is hired by Lex Luthor to take down Superman. But of course, Deadpool being Deadpool, he ends up befriending Superman instead. He could constantly annoy Superman with his non - stop chatter and crazy stunts, but also help him in unexpected ways, like using his regenerative abilities to protect civilians during a big battle.
I really like 'X - Men and Justice League: Crisis of Two Worlds' in the 'X men dc crossover fanfic' genre. It delves into how the different power dynamics and moral compasses of both universes interact. It's full of intense battles and interesting character interactions.