Fanfiction often gives a new perspective to their relationship. It could be that Godzilla and Mothra have a deeper connection that was not explored in the original movies. Maybe they communicate in ways that humans don't understand, and in fanfiction, writers try to explain that connection. They might also be part of a bigger ecological balance in the fictional world created by the fanfic writers.
Well, in a lot of mothra human fanfiction, the theme of environmentalism is quite prominent. Since Mothra is often associated with nature, stories might show how humans and Mothra team up to save the environment. Another common theme is discovery. The human characters might discover something new about Mothra, like a hidden power or a different side of her personality. Also, the theme of sacrifice can be found. Sometimes, either Mothra or the human has to make a sacrifice for the greater good.
One common theme is the struggle between her kaiju nature and her human form. For example, in many stories, she has to deal with emotions and limitations that are new to her in human form.
One popular mothra human fanfiction is 'Mothra's Bond with the Human World'. It tells a story about a young scientist who discovers a unique connection with Mothra and they end up on an adventure to save the planet from an environmental disaster. Another great one could be 'Mothra and the Human Savior' where a human is chosen by Mothra to help in a battle against an ancient evil. There's also 'The Friendship of Mothra and a Human Girl' which focuses on the relationship between Mothra and a girl who can communicate with her.
A young adventurer could be the main character. This person is always fascinated by the legends of Godzilla and Mothra. One day, while exploring an uncharted island, they stumble upon a situation that involves both kaiju and then gets dragged into their world.
One idea could be a human scientist who discovers a way to communicate with Mothra and tries to convince her to team up with Godzilla against a new common enemy, like an alien invasion. The scientist could be in a race against time as the world is being quickly overrun.
There's also a story where Mothra's human form teams up with other kaiju in human form to protect the world. It delves deep into her relationships and the challenges she faces in a more human - like world. In this fanfiction, Mothra's human form uses her elegance and grace to negotiate with the other kaiju.
Humans play crucial roles in Godzilla and Mothra fanfiction. They can be the ones observing and documenting the actions of these giant creatures. For instance, a scientist in the fanfic might be studying Godzilla's behavior to find a way to coexist peacefully.
In a King Ghidorah x Mothra fanfiction, a possible plot could be that King Ghidorah is somehow injured and Mothra, being the more benevolent of the two, decides to heal him. As she heals him, she also tries to change his evil ways. This could be a story of redemption for King Ghidorah, and how Mothra's kindness can have a profound impact on even the most evil of creatures.
Well, a fanfiction could be set in an alternate universe where King Ghidorah and Mothra are the last two of their kind. They have to find a way to repopulate their species, but their natural instincts are so different. King Ghidorah is more about destruction and dominance, while Mothra is about life and harmony. This conflict could be the central theme of the story, exploring how they try to overcome their differences for the greater good of their species.