One common theme is the clash of different technologies. The high - tech world of the Avengers with Iron Man's suits and SHIELD's gadgets, and the advanced alien technology of the Transformers. Another theme is teamwork. How the Avengers, who are used to working together, interact with the Autobots or Decepticons, which have their own group dynamics.
Sure. 'The Autobots and the Avengers: A Crossover of Titans' is a great one. It has an exciting plot where the Autobots team up with the Avengers to fight a common enemy that threatens both their worlds. The character interactions are really well - written, like Optimus Prime and Captain America strategizing together.
The plot might involve the Avengers being called to investigate strange energy signatures which turn out to be related to the AllSpark from the Transformers universe. The Decepticons are after the AllSpark and the Autobots are trying to protect it. The Avengers and Autobots join forces. Thor could use his powers to fight off the Decepticons' attacks from the air, while Hulk could take on the physically strong ones. The fanfiction could also explore how the different personalities of the Avengers and Transformers interact, like the witty banter between Spider - Man and Bumblebee.
A really cool crossover idea would be the Avengers trying to understand the Transformers' technology. Iron Man, being a tech - genius, would be fascinated by the Autobots' transformation ability and their energy sources. He might try to reverse - engineer some of it, which could lead to some interesting plot twists. And the Hulk could be an unexpected ally in battles against the Decepticons, using his brute strength to take on the powerful robots.
Well, Iron Man and Ratchet might start off on the wrong foot. Iron Man, with his cocky attitude, might try to show off his tech to Ratchet, who would be unimpressed and critical of Stark's technology in comparison to Cybertronian tech. But they could later come to respect each other's skills.
Well, perhaps a plot where the AllSpark from Transformers ends up on Earth and its energy attracts both the Transformers and the Avengers. The Avengers are initially suspicious of the Transformers. But as they learn about the Decepticons' plan to use the AllSpark for evil, they join forces. The Hulk could even have some interesting interactions with the larger Transformers like Grimlock.
A common theme is the adaptation of characters to new environments. For example, how a Transformer would react in the magical world of Harry Potter or how an Avenger would handle the technology of Transformers. Also, redemption arcs for characters from different universes are quite popular, like a once - bad character from Transformers finding a new purpose while helping Harry Potter characters.
There are some really cool crossovers. For example, in some fanfictions, the magic from Harry Potter is combined with the high - tech of Transformers. Avengers characters might get involved in a battle where they have to deal with both magical and mechanical threats. It's a wild mix that can lead to some unique and exciting storylines.
A great plot could be that a powerful artifact from the Transformers universe is found on Earth and it has the power to either save or destroy the planet. The Avengers initially think it's a new weapon or power source, while the Autobots know its true origin. They have to convince the Avengers of its importance and together protect it from the Decepticons and any other villains who want to use it for their own evil purposes.