Godzilla is an obvious choice. The dynamic between Mechagodzilla and Godzilla can create intense and exciting stories. Also, Mothra could be included. Her gentle nature could contrast with Mechagodzilla's more mechanical and often aggressive nature. Another character could be King Ghidorah. The three - headed monster could form an alliance or be in direct conflict with Mechagodzilla in a fanfic.
A 'godzilla x destoroyah fanfic' could potentially explore an alternate universe where Godzilla and Destoroyah interact in unique ways. It might focus on their battles, with detailed descriptions of their attacks and defenses. For example, it could show Godzilla's atomic breath clashing with Destoroyah's energy beams.
In a Mothra x Destoroyah fanfic, the story could start with Destoroyah causing chaos in a major city. Mothra senses the danger and comes to the rescue. Their first encounter could be a brief skirmish where they test each other's strength. As the story progresses, the author might delve into the mythology behind both kaiju. For example, Mothra's role as a protector of the Earth and Destoroyah's origin as a more destructive force. This could lead to a complex plot where Mothra tries to find a way to either defeat Destoroyah or find a way for them to coexist.
In a Mothra x Destoroyah fanfic, a possible plot is that a group of humans discover a way to manipulate both kaiju. They try to use Mothra and Destoroyah as weapons in a war against other countries. However, Mothra and Destoroyah resist and end up joining forces against the humans who are trying to control them. This would show a different side of their relationship, not just as enemies but also as beings that can unite against a common foe.
Another theme is the search for identity. The female Mechagodzilla may be different from the traditional Mechagodzilla, and the fanfiction explores how she figures out who she is in the context of the kaiju world. She could be a hybrid of different technologies or have unique abilities that make her question her origin and purpose.
A Mechagodzilla x Mothra fanfic might explore their different natures. Mechagodzilla, being a man - made weapon of destruction, and Mothra, a symbol of nature and rebirth. The story could be set in a post - apocalyptic world where they have to work together to restore balance. Or perhaps it's a story of how their conflict shakes the very foundation of their world. There could be elements of human interference, like scientists trying to control Mechagodzilla while Mothra tries to protect the natural order.
One idea could be a crossover with the Transformers. Picture Mechagodzilla teaming up with Optimus Prime against a common enemy like an alien invasion force. They could combine their powers, with Mechagodzilla's brute strength and Optimus' leadership and advanced weaponry.
One idea could be a story where Mechagodzilla is reprogrammed by a young genius to protect the city instead of causing destruction. Another could be a time - travel fanfic where Mechagodzilla is sent back in time and has to face off against its earlier versions. Or perhaps a fanfic where Mechagodzilla teams up with other kaiju to fight a common, even greater threat.
Often, a theme of coexistence or conflict is present. Since they are so different, they can either find a way to live side by side in the story world or be in constant conflict. Also, the idea of redemption might be there. If Mechagodzilla is initially a force of evil, it could seek redemption through its interactions with Mothra. And there's the theme of the balance of the world. Their actions can tip the balance towards destruction or restoration.