One common plot twist could be that Aria survives the shot but loses her memory. This then leads to a whole new set of relationships and self - discovery as she tries to figure out who she is and who would want to harm her. Another could be that the person who shot her is someone she thought was a friend all along, creating a sense of betrayal and mystery.
Well, sometimes in Aria gets shot fanfiction, a plot twist might be that the shooting was part of a bigger conspiracy. Maybe there's an underground organization that targeted Aria for a specific reason, like she unknowingly has some sort of special power or information. It could also be that the bullet had some strange effect on her, like it transferred some sort of energy that gives her new abilities.
One common plot twist could be that the shot was actually a set - up by someone close to Conan, like a fellow detective who has been secretly working for the bad guys. Another could be that the shot has some sort of strange side effect, for example, it gives Conan a new power or ability that he has to figure out how to use while still solving cases. Maybe the shot was a misfire from a weapon that was supposed to be used on someone else entirely, and Conan becomes a key witness in a much larger conspiracy.
The story can build tension by having Aria's condition deteriorate slowly. For example, the doctors are not sure if she will make it through the night, and her friends and family are left waiting anxiously. Another way is to introduce threats from the shooter, like leaving anonymous messages saying that they will finish the job if Aria survives.
Perhaps the person who shot Danny was actually a hired assassin, and the real mastermind behind the shooting is a powerful criminal figure that Danny was getting too close to in his investigations. This would open up a whole new storyline where Danny has to figure out who hired the shooter while also dealing with his physical and emotional trauma from being shot.
One possible plot twist could be that the person who shot Shawn was someone he knew and trusted, like a former client who had a hidden agenda. Another twist could be that the shooting was a case of mistaken identity, and Shawn was actually targeted because of someone else's actions.
Sometimes, the plot twist is that Stiles is actually in on the kidnapping in a way. Maybe he's trying to protect his friends from a greater danger by faking his own kidnapping. So all the while his friends are searching for him, he's actually on a secret mission of his own, which is revealed later in the story and makes for a really interesting read.
One common plot twist could be that a close friend or ally, who Ichigo thought he could trust completely, turns out to be working for the enemy all along. For example, Orihime might be brainwashed by a powerful Hollow to feed information about Ichigo's whereabouts and plans to the Hollows. Another could be that the Soul Society, which Ichigo has often helped, decides to turn on him due to some false accusations of him being too dangerous. Maybe they believe he is on the verge of losing control of his Hollow powers and decide to eliminate him before he becomes a threat to both the living world and the Soul Society.
One common plot twist could be that the kidnapper is someone Allen thought was a friend all along. It adds a sense of betrayal and shock to the story.
In some fanfictions, a plot twist could be that Haruhi's kidnapping is part of a virtual reality game that she unknowingly entered. The 'kidnappers' are just players in the game who are trying to win by capturing her. Another common plot twist is that the kidnapper has a change of heart halfway through. They start to see Haruhi's good qualities and instead of harming her, they end up helping her. And sometimes, it could be that the kidnapping is a test set by a mysterious organization to see if Haruhi is worthy of some special task or knowledge.
One common plot twist could be that the person she trusts most, like her best friend, betrays her for power. Maybe her friend is offered a high - ranking position in a magical guild or something and has to sacrifice Lucy to get it. Another could be that a love interest betrays her. He might be secretly working for an enemy and using Lucy to get information about her family or her magic.
One common plot twist could be that Hinata finds out she was actually set up. Maybe someone was jealous of her relationship and made it look like her partner cheated. This would add a layer of mystery and give Hinata a chance to fight for her relationship.