Mermaid Man x Spongebob Fanfic: What are some interesting plot ideas?

Perhaps a time - travel fanfic where Spongebob and Squidward go back in time to the prehistoric era of Bikini Bottom. They have to figure out how to survive among the strange and giant sea creatures there. Spongebob's naivete and Squidward's cautious nature would create a great dynamic as they try to find their way back to their own time. Spongebob might be excited to meet the ancient versions of their friends, while Squidward is just worried about getting eaten.

A mermaid x human fanfic could start with a human sailor getting lost at sea. A mermaid finds him and guides him to safety. As a result, they develop a relationship. They might face challenges like the mermaid's family not accepting the human or the human having to keep the mermaid a secret from his own kind. Another plot could be a young girl who has always dreamed of mermaids and one day, while swimming, she actually meets one. They become friends and the girl starts to learn about the mermaid's culture and way of life. And yet another idea is a mermaid who is curious about the human world above water and she meets a human who is equally curious about her world. They embark on a journey of discovery together.

Another idea is a story where Sandy wants to introduce some of her land - based inventions to the underwater world. Spongebob helps her with the process, but things go hilariously wrong at first. For example, a machine that is supposed to make the water around Bikini Bottom cleaner ends up making it all muddy. They then have to work together to fix it and learn a valuable lesson about testing things properly before using them in a new environment.

Well, a mermaid fanfic could revolve around a mermaid who is half - human due to some magical experiment. She tries to fit into both the human world and the mermaid world. Also, a story where mermaids are in a war with another underwater species like the selkies. And a mermaid who is an artist and uses the treasures from the ocean floor to create beautiful works of art that she shows to a human she befriends.

One idea could be that Squidward gets turned into a vampire. He then tries to turn Bikini Bottom into a spooky vampire realm, but Spongebob, being his usual positive self, tries to stop him and turn him back to normal with the power of friendship and some kelp - made anti - vampire potions.

One idea could be that Spongebob and Squidward accidentally switch personalities. So Spongebob becomes grumpy and Squidward becomes overly enthusiastic. It would lead to a lot of comical situations in Bikini Bottom.

Mermaid Man was once a human superhero. He had a partner named Barnacle Boy. They fought crime in their own city. Over time, they got old and retired to Bikini Bottom. There they became sort of local celebrities. SpongeBob and Patrick idolize them.

It could focus on their unique personalities and how they complement or clash in various situations. Maybe it has some funny or heartwarming moments involving them.

You could also create a fanfic where the Little Mermaid meets other mythical creatures on her journey. For instance, she could encounter a group of friendly sea sprites who guide her to a hidden underwater kingdom. In this kingdom, she discovers a way to be with the prince without sacrificing her voice or her mermaid form. It would be a more adventurous and magical take on the original story.

One idea could be a lemonade - themed adventure. Spongebob and his friends could discover a magical lemonade tree in Bikini Bottom. They would have to protect it from Plankton who wants to use it to make his chum taste better. Another could be a lemon - scented day where all of Bikini Bottom smells like lemons and everyone has different reactions, some love it and some find it too overpowering.