Manda might be a long - lost friend of Harry's family. Maybe she was thought to be dead, but Harry discovers a way to summon her through some ancient magic. She could then play a role in revealing secrets about Harry's family past.
Kaiju novels often portray kaiju as gigantic and powerful beings. They are usually depicted as forces of nature that are difficult to control or defeat. For example, in 'Godzilla' novels, Godzilla is shown as a nearly indestructible creature with its atomic breath and massive size.
One popular 'kaiju x kaiju fanfic' story could be about Godzilla and Mothra forming an alliance in a unique way. Maybe they team up against a new, more powerful enemy that threatens their world.
In fanfiction, Naruto's contract with Manda can be really interesting. Sometimes, it might deviate from the original story. Writers could create scenarios where Naruto forms the contract under different circumstances, like in a time - travel plot or an alternate universe. Maybe he has to prove himself in a new way to Manda, not just with strength but also with his understanding of the snake's nature.
A great 'kaiju x kaiju fanfic' should have a strong opening that grabs the reader's attention. You could start with a big battle scene or a mysterious event involving the kaiju. Then, develop the characters of the kaiju. Give them motives and desires. If you're writing about a lesser - known kaiju, introduce it in an interesting way. Throughout the story, build up the tension and drama. Whether it's a race against time to stop an evil kaiju or a struggle for power among the kaiju, keep the reader engaged with twists and turns. And don't forget to end the story in a satisfying way, whether it's a happy ending with the kaiju living in harmony or a bittersweet ending where one kaiju sacrifices itself for the greater good.
How about a Kaiju that can split into multiple smaller versions of itself? This would be a strategic advantage as the Jaegers would then have to deal with several threats at once. Each smaller Kaiju could have a different ability, such as one being able to spit acid and another being extremely fast.