One way is to give more backstory to why he's a jerk. Maybe he had a tough upbringing or some sort of betrayal in his past.
Adding more complex relationships with other characters. For example, if there's a character who tries to reform him or someone who is constantly in conflict with him because of his jerk - like behavior.
In that 'jackson storm is a jerk fanfiction', it might be that the writer is trying to show a different side of him compared to his usual representation. It could add a new dimension to the overall story universe. For example, if he's a jerk, it might lead to different interactions with other characters and drive the plot in unique ways.
To make it more interesting, you could introduce a new and mysterious character that Percy meets while alone. This character could have a hidden agenda or a special connection to Percy's past.
Create a really vivid and detailed underwater world. When Percy is facing his fear of drowning, the reader should be able to feel like they are there with him. Describe the coldness of the water, the way the light refracts, and the strange creatures that lurk. Make his fear palpable through the description of his surroundings. Also, give Percy a clear goal that is related to his fear. Maybe he has to retrieve an important item from the bottom of a dangerous underwater trench, and the only way to get it is to face his fear head - on.
Add complex characters. For example, introduce a new villain who is behind the hypnosis and has a deep backstory. This gives more depth to the plot.
By adding unique twists to the story. For instance, instead of a normal pregnancy, it could be a magical pregnancy with special powers or abilities that come with it. This would add an element of fantasy and make the fanfiction stand out.
One way to make Chunin more interesting in Naruto fanfiction is by giving them unique jutsu. For example, a Chunin could have a jutsu that manipulates the environment in an unexpected way. This would make their battles more exciting.
If we want to make 'Percy Jackson Mind Control Lemon Fanfiction' more appropriate, we need to ditch the 'lemon' which usually implies adult content. For the mind control part, we can make it more of a moral or ethical struggle. Maybe Percy is mind - controlled by an ancient magic that makes him question his values. His friends could then be the ones to help him see the light again through their love and support, much like how they always support each other in the original books.
One way is to add a common enemy. By introducing a powerful foe that both Naruto and Rias have to face together, they can gradually overcome their initial hatred. For example, a new, extremely powerful demon or a group of rogue ninjas that threaten both their worlds.
By adding more characters from both universes. For example, having Sasuke interact with Stocking's sister Panty could bring in a whole new dynamic.
One way to make it more interesting is through the use of different settings. Instead of just the usual Hogwarts setting, take the characters on an adventure outside, like to a magical forest or an ancient wizarding ruin. Daphne's possessiveness could play out differently in these new and dangerous environments. For example, she might be more overprotective because of the unknown threats, or her possessiveness could lead to her making a mistake that endangers them both. This would add excitement and novelty to the fanfiction.