Perhaps Bianca has been poisoned, and Percy has to find a rare antidote within a time limit. He might have to journey to a far - off land, facing many challenges along the way. Or, it could be that Bianca has been lured into a trap by a false friend, and Percy has to expose the traitor and rescue her from the ensuing danger.
Perhaps Medusa has some crucial information that Percy needs to save the world, and in order to get that information, he has to protect her from other threats. So he embarks on a journey to keep her safe.
One interesting plotline could be them teaming up to rescue a captured demigod. They could use their unique abilities, Percy's water - related powers and Bianca's skills with a certain weapon or magic. Another plotline could be them exploring an unknown part of the mythological world together, facing strange creatures and ancient puzzles.
One possible title could be 'Percy's Rescue of Bianca and Zoe'.
Well, in a 'percy saves bianca fanfiction', it could start with Bianca getting into a perilous situation, like being captured by an evil force. Percy, with his heroic nature, decides to rescue her. The story could then delve into how Percy overcomes various obstacles to reach Bianca. It could also show how their friendship or relationship evolves as a result of this rescue mission. There might be elements of magic, friendship, and adventure, just like in the Percy Jackson books.
The setting of the rescue is also important. Is it in a dark, dangerous forest? Or perhaps in an ancient, crumbling castle? The setting can add to the atmosphere and the challenges Percy has to face. If it's in a forest full of monsters, he'll have to fight his way through them to reach Bianca and Zoe.
Another plotline could be that Percy has been wrongly accused of something major, like causing a disaster that he had no part in. Poseidon steps in to prove his son's innocence. He might use his influence among the gods or his ability to see the truth through the ocean's currents to clear Percy's name. This often involves some political intrigue among the gods as well.
A possible plotline could be that Tayuya is captured by an evil organization, and Naruto goes on a solo mission to save her. He uses his stealth skills to infiltrate the enemy base.
It could be that a powerful sorcerer in the Avengers' world goes rogue and starts using dark magic. The Avengers don't know how to handle magic, so Harry is called in. He has to face this rogue sorcerer, using his own brand of light magic. Along the way, he might have some clashes with the Avengers' way of doing things, but in the end, they all work together and Harry manages to save the day by defeating the rogue sorcerer and restoring peace in the Avengers' world.
The OC could be a wandering ninja who stumbles upon the situation where Kushina is in danger. Maybe they are initially just passing through, but their sense of justice compels them to step in and save her. Then, they might get involved in the larger Naruto world events as a result of this encounter. They could also form a bond with Kushina, which could lead to different relationships with other characters like Minato or Naruto in the future.
One possible plotline could be that Bernardo gets into a dangerous situation, like being trapped in a burning building, and Tony risks his life to save him. Maybe there's a feud between their groups, but Tony's sense of justice or his personal feelings for Bernardo override that.