No. The original Spongebob series is all about fun, friendship and adventures in Bikini Bottom. The 'Spongebob real story' is a completely different and often very dark and inappropriate take that has nothing to do with the original positive nature of the show.
A new character, like a traveling musician fish. Spongebob is always open to new things and experiences, and a music - loving fish could charm him with her melodies. She could perform at the Krusty Krab and Spongebob would be entranced by her talent.
Mr. Krabs would probably be thinking about how this could be good for business. He might see it as an opportunity to create a new tourist attraction. Patrick would be really happy for Spongebob at first, but then he might get a bit jealous because he doesn't want to lose his best friend. Squidward would be extremely annoyed by all the commotion and the fact that he has to be part of the wedding in some way.
One way would be to introduce a new character who is interested in Spongebob. This would make Sandy realize her feelings for him. They could then have a series of events where they are forced to work together closely, like building a big project for the whole Bikini Bottom. During this process, they would start to notice the little things about each other that they like. Their friendship would slowly transform into a love story as they start to hold hands, exchange little gifts, and have secret looks at each other.
Well, there are so many stories in Spongebob's world. One of the classic ones is about how he and Patrick went jellyfishing. They grabbed their nets and headed out to the Jellyfish Fields. Spongebob was so excited as always. They chased the colorful jellyfish all day long. It was a really fun adventure full of laughter and silly moments.
No. Spongebob is a family - friendly character, and any form of 'abusive fanfic' goes against the positive and light - hearted nature of the show. It's not acceptable.
I'm not entirely sure what 'abusive Spongebob fanfic' specifically is. It might be a type of fan - created story about Spongebob that contains elements of abuse, which is really not a positive or ethical form of fan creation. Fanfic should generally be positive and in line with the spirit of the original work.