What are some interesting plot ideas for a mermaid x human fanfic?

One plot idea could be that Mermaid Man takes Spongebob on a special mission to save Bikini Bottom from a new and mysterious villain. Spongebob, being his eager self, follows Mermaid Man's every instruction and in the process, they form a deeper bond as friends. Another could be that Mermaid Man decides to train Spongebob to be a proper sidekick, leading to comical training sessions where Spongebob tries his best but often fails in a humorous way. Maybe there's also a plot where Mermaid Man loses his memory and Spongebob has to help him remember who he is and his heroic deeds, all while facing the challenges that come with Mermaid Man's altered state.

One idea could be that a human scientist is working on a project related to Mewtwo's powers. They start to communicate on a deeper level, and Mewtwo begins to see the human as an ally rather than an enemy. The human, in turn, tries to understand Mewtwo's complex emotions.

A plot could involve Isabelle having special powers that she doesn't fully understand. A human scientist discovers her and tries to study her, but they gradually form a bond as the human helps Isabelle understand her powers better. This could lead to a story of friendship and self - discovery against the backdrop of a world that doesn't quite understand their relationship.

One idea could be the symbiote giving the human male some extraordinary powers, like enhanced strength and agility. The male then has to learn to control these new abilities while hiding them from the world. Another plot could involve the symbiote having a mind of its own and conflicting with the male's moral code. For example, the symbiote might want to take revenge on someone who wronged it in the past, but the male is against violence.

One plot idea could be a human soldier being captured by a Viper. Instead of killing the human immediately, the Viper discovers an unexpected connection with the human. Maybe they both have a shared memory from a past encounter with a third alien species that makes the Viper spare the human. Then, they form an uneasy alliance to face a greater threat in the Xcom universe.

One idea could be that a human stumbles into Equestria and meets Princess Luna. Luna is initially suspicious but as she gets to know the human, they form a bond over their shared love for stargazing. Another could be a human who has the power to enter dreams like Luna, and they team up to fight a nightmare - inducing villain in both the human world and Equestria. Or perhaps a human artist who is inspired by Luna's beauty and grace, and through his art, he catches her attention and a friendship develops.

One idea could be a pirate captain who discovers a mermaid in his ship's hold. She was captured by his crew thinking she was a good luck charm. The pirate, against his tough exterior, starts to feel sympathy for her and tries to protect her from his more superstitious and cruel crew members.

A possible plot could involve the male human being a trainer who has a unique connection with the female Lucario. They enter a Pokémon tournament where they face numerous challenges together, not only in battles but also in dealing with the politics and rivalries among other trainers. Their relationship deepens as they rely on each other to succeed.

One idea could be an alien with unique telepathic abilities forming a deep bond with a human. The alien might be on a secret mission on Earth and the human gets accidentally involved. They start to understand each other's cultures and values, leading to a friendship that defies the differences between their species.

One idea could be a story where a human scientist is studying sharks and forms an unexpected bond with a particularly intelligent shark. They communicate in some unique way and end up helping each other, like the shark leading the human to a hidden underwater treasure which in turn helps the human protect the shark's habitat.