In a Spongebob vampire fanfiction, Mr. Krabs could be turned into a vampire by a cursed doubloon. He starts to see all the fish in Bikini Bottom as a source of 'golden blood'. Spongebob and Patrick have to figure out a way to break the curse. They go on an adventure to find a magical conch shell that has the power to reverse any curse in the ocean. Along the way, they face many challenges like avoiding the vampire Mr. Krabs and other sea monsters.
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.
Perhaps a vampire from the surface world accidentally ends up in Bikini Bottom. This vampire is used to preying on humans, but now has to deal with sea creatures. Spongebob befriends the vampire and shows him that there are better ways to get 'food' like eating kelp cakes instead of sucking blood. The vampire then has to decide whether to stay in Bikini Bottom and adapt or try to find a way back to the surface.
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.
Well, perhaps in the fanfiction, Spongebob and Pearl could start a business together. Since Pearl loves lemons, they could open a lemonade stand in Bikini Bottom. But they have to deal with Mr. Krabs who is jealous of their success. Or, they could go on an adventure to find the rarest lemon in the ocean, which is said to grant wishes. Along the way, they meet new friends and enemies.
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.
One idea could be a story where Spongebob and Patrick go on an adventure to a new underwater kingdom that no one in Bikini Bottom has ever visited. They could encounter strange new creatures and have to use their friendship to get out of tricky situations.
One idea could be a crossover with the Teenage Mutant Ninja Turtles. Picture Spongebob and his friends in the sewers of New York, trying to help the turtles fight Shredder. Maybe Squidward could use his clarinet as a weapon in a comical way.
One plot idea could be that Spongebob and Squidward are human neighbors. Spongebob is always overly cheerful and throws noisy parties, which annoys the grumpy Squidward. But then they end up having to work together on a community project and slowly start to understand each other better.
One idea could be that Spongebob and Patrick end up in the Loud House world. They could be really confused by all the human stuff and the big family. Maybe they try to make a Krabby Patty in the Loud House kitchen but use the wrong ingredients and chaos ensues.
One idea could be that Spongebob, as a sponge in a human world, tries to adapt to human life to be closer to Sandy. He could go to a human school and struggle with the different subjects, all while having a budding romance with Sandy. Another plot could be that Sandy is working on a big scientific project and Spongebob wants to help her, but his naivete causes some comical mishaps in the lab.
One idea could be that Merlin, as a wizard, is hunted by vampires because his magic is seen as a threat to their existence. But then he discovers that some vampires are not as evil as he thought and they form an uneasy alliance to fight a common enemy, like a dark sorcerer.
Well, you could have a story where a small town is suddenly surrounded by vampires. The townspeople have to quickly learn how to defend themselves. Maybe they start using old - fashioned weapons like stakes and crossbows. And there could be a mystery within the town, like someone is secretly working with the vampires. This adds an element of suspense to the survival aspect.