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 fanfiction plot could be during a village invasion. Naruto, with his unwavering sense of justice and his growing feelings for Hinata, shields her from an enemy's attack. He might get seriously injured, which then spurs Hinata to tap into her own hidden power to defend him in return. This kind of story can explore their bond deeper and show how they support each other in tough times.
One possible scenario could be that Shinra and Iris are in a battle against some powerful demons. Shinra tries his best to shield Iris from the demons' attacks. As he does so, he gets seriously injured but still manages to hold off the demons long enough for backup to arrive. Iris is deeply moved by his selfless act and vows to become stronger to protect him in the future.
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.
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 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.
One possible plot could be that Shinra and Maki are in a dangerous situation, like in a battle against a powerful foe. Shinra steps in front of Maki to shield her from an attack, getting hurt in the process. Maki then has to find a way to either heal Shinra or get them both to safety while still fending off the enemy. It could also involve some emotional moments where Maki realizes how much Shinra is willing to sacrifice for her.
In a plotline, the enemy might be after Vivi for some political reason. Luffy steps in without hesitation. He gets hurt but his determination to protect Vivi doesn't waver. This could lead to the Straw Hat crew coming together in a new way to face the threat. For example, Nami could use her navigation skills to find a safe haven where Luffy can recover while the others hold off the enemy.
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.
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.
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.