Another plotline could be in a more complex political situation. There's a conspiracy to harm Sakura because of her association with certain powerful figures. Naruto, being always protective of her, gets caught in the crossfire and is injured. This forces Sakura to step up, not just as a medic but also as a strong ninja to protect Naruto in return and expose the conspiracy.
In some fanfictions, Naruto might get hurt protecting Sakura during a mission gone wrong. Maybe they are infiltrating an enemy base and are discovered. Naruto shields Sakura from a barrage of attacks, resulting in his injury. This then creates a tense situation where they have to find a way to escape and get Naruto medical help, all while their relationship deepens.
One common plotline could be Naruto facing a powerful enemy alone to safeguard Sakura. For example, in a fight against a rogue ninja who has a vendetta against Sakura's medical skills, Naruto jumps in front of an attack meant for her. This could lead to him getting seriously injured and Sakura having to use her medical ninjutsu to save him while also realizing her true feelings for Naruto.
There could be a fanfiction where Naruto and Ino are exploring an ancient ruin. Unbeknownst to them, there are traps everywhere. When a huge boulder starts rolling towards Ino, Naruto pushes her out of the way. He gets crushed under the boulder's edge. Ino is desperate to save him. She manages to find some herbs in the ruin that have healing properties and uses her medical knowledge to treat Naruto's injuries. Meanwhile, Naruto's willpower also helps him in his recovery.
One possible plotline could be that Timmy and Trixie are in a magical forest when a group of dark fairies attacks. Timmy uses his fairy - godparent powers to shield Trixie from their harmful spells, getting hurt in the process. Trixie then has to find a way to help him, like searching for a special healing flower.
In many Beast Boy and Raven fanfictions, Beast Boy's act of protecting Raven is quite common. When he gets hurt in the process, it often adds a layer of drama. Maybe he takes a blow meant for Raven during a battle with a powerful villain. This could lead to Raven realizing her deeper feelings for him as she tends to his wounds.
Maybe they are in a forest filled with dangerous magical creatures. A giant snake - like creature lunges at Annabeth. Percy quickly moves in front of her and the creature bites his leg. In another situation, they are in a magical maze. There are walls closing in on them and spikes starting to protrude from the sides. Percy pushes Annabeth out of the way of a spike that was about to impale her, but he gets scratched all over his body. And they could be in a fight against a powerful sorcerer. The sorcerer casts a spell of dark energy towards Annabeth, and Percy uses his own power to try and block it. However, some of the dark energy seeps through and causes internal damage to Percy.
In the fanfic, it might be set in an alternate universe where Sakura has a different personality. She could be more aggressive and competitive with Naruto. During a sparring match, she goes too far and seriously hurts Naruto. This could then be the starting point of a story about Naruto having to forgive her and them rebuilding their friendship.
In a story, there could be a situation where a magical curse is spreading. Beast Boy, seeing Raven in the path of the curse, uses his own body to block it. As a result, he is infected by the curse which starts to harm him physically and mentally. Raven then embarks on a journey to find a cure, all the while taking care of Beast Boy and their relationship deepens through this difficult time.
One possible plot could be that there is an attack on the kingdom where Princess Hisui resides. Natsu, being the brave character he is, jumps into action. As he battles the invaders, he gets hurt while making sure no harm comes to the princess. Maybe the invaders have some sort of dark magic that Natsu underestimates, and it catches him off - guard, resulting in his injury.
One popular plotline is the challenges they face in rebuilding their relationship after Sasuke's long absence. Another is how they adjust to married life within the Hidden Leaf Village, dealing with the expectations of the villagers. There could also be a plotline where they face a new threat together as a married couple, strengthening their bond in the process.
A great plot point could be the emotional reaction of Ino. For example, when Naruto gets hurt, she might feel guilty for not being strong enough to protect herself. This could lead to her training harder in the future. Another point is how Naruto's friends react. They might be angry at Ino for being in a situation where Naruto had to risk his life, creating some tension in the group. And Naruto himself might have some internal thoughts about his decision to protect Ino, like realizing how important she is to him as a friend or more.
One possible plotline could be that Sakura, perhaps under the influence of some dark force or a misunderstanding, physically attacks Naruto. This could be due to a false belief that Naruto has done something terrible to their village or friends. Another plotline might involve Sakura's words hurting Naruto deeply. For example, if she tells him that he will never be good enough or that she doesn't really consider him a true friend after all. It could also be that Sakura's actions in pursuit of Sasuke end up causing Naruto pain indirectly, like if she constantly ignores Naruto's feelings for her while she chases Sasuke, making Naruto feel unimportant and hurt.