Well, for a httyd transformers crossover fanfic, start with a strong concept. Maybe something like the Autobots land on Berk and have to figure out how to deal with the dragons. Focus on the interactions between the characters. The vikings' reactions to the giant robots and the Transformers' views on the dragons would be really interesting to explore. And make sure your writing style is engaging, using vivid descriptions to bring the crossover world to life.
One idea could be that the dragon's fire power can be used to recharge the Transformers in some way. Another is that the Autobots could learn the concept of flying from the dragons and incorporate it into their own designs. Or perhaps the Decepticons try to capture the dragons to use their power for evil purposes, and the vikings and Autobots have to work together to stop them.
First, you need to understand the characters and worlds of both HTTYD and Frozen. Then, think of an interesting plot that can bring the two together, like maybe a dragon from HTTYD somehow ends up in the Frozen world. Next, start writing the story, focusing on how the characters from both universes interact with each other.
There are often crossovers with other fantasy universes. For example, in some 'httyd crossover fanfic', the Vikings from httyd meet the characters from 'Narnia'. The contrast between the two worlds, one with dragons and the other with magical creatures like centaurs and fauns, makes for a really engaging story. It can bring new adventures and challenges for the httyd characters.
One idea could be to have Toothless meet Jack Frost. Maybe Jack could try to ride Toothless and they could have an adventure together exploring the skies and the wintery landscapes. It would be cool to see how their different powers interact, like Toothless' fire against Jack's ice.
One idea could be that the dragons in HTTYD are attracted to the cold of Frozen's world and they fly there. The people of Arendelle are initially scared but then they learn about the dragons from the dragon riders. Another idea is that Elsa's ice powers somehow have an effect on the dragons, like making their fire breath turn into ice breath for a short time.
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 common theme is the clash of different cultures. The high - tech, mechanical world of the Transformers and the more magic - based, diverse world of RWBY often lead to interesting cultural exchanges. Another theme is teamwork. Characters from both universes have to learn to work together to face threats. For example, the Autobots and the Huntsmen might combine their strengths to defeat a powerful enemy.
One interesting idea could be a crossover between Transformers and the Harry Potter universe. Imagine Optimus Prime leading the Autobots through Hogwarts, facing magical threats alongside the wizards. Another could be a Transformers and Star Wars crossover, with the Autobots and Decepticons getting involved in the Galactic Civil War. Maybe the Transformers' advanced technology could have an impact on the balance of power in the Star Wars galaxy.
To write a good transformers animated crossover fanfic, first, be well - versed in the different Transformers universes you want to cross over. For example, know the characters, their personalities, and their story arcs in each series. Then, come up with an interesting plot that can bring these different elements together in a unique way. Maybe it could be a situation where characters from different Transformers shows have to team up to fight a common enemy. Also, focus on character interactions. Show how the characters from different series react to each other, whether it's with shock, excitement, or suspicion. This can add depth to your story. Finally, don't forget to proofread and edit your work to make sure it flows well and is free of grammar and spelling errors.