By making the consequences of their actions towards each other more severe. Say Naruto's actions lead to Ino being seriously injured and she loses her ability to use some of her ninja skills for a while. The fear of whether she will ever regain those skills and the guilt Naruto feels can create a lot of tension in the story. Also, if there are external factors like other ninja clans getting involved in their conflict because of what happened between Naruto and Ino, that can add more layers of tension.
Writers can create tension by focusing on the power imbalance. Since vampires are stronger, the human is in a vulnerable position. For example, if the vampire is holding back from fully harming the human but the human doesn't know that, it builds suspense. Also, the threat of the vampire losing control, like when they are extremely thirsty, adds to the tension.
To create tension in Danny Phantom x Vlad Hurt fanfiction, writers can focus on the psychological aspect. They can show Danny's internal struggle with his fear of Vlad and his determination to protect his loved ones. By delving deep into Danny's mind, the reader can feel his anxiety and the high stakes. Additionally, unexpected plot twists can create tension. For instance, if it seems like Danny has finally found a way to defeat Vlad, but then it turns out that Vlad has a backup plan that makes the situation even worse. This keeps the reader guessing and on the edge of their seat.
Another way is through the description of Taehyung's own state. If he's in pain but trying to be strong, or if he's confused and hurt by the situation, it makes the readers feel for him. The writers might also introduce some obstacles in his recovery process, like a lack of proper medical facilities or some internal conflicts within the group that delay his getting better. This all serves to create and maintain tension throughout the fanfiction.
They can introduce a race against time. Maybe Deidara needs medical help within a short period, but there are obstacles in the way, like the enemy still lurking around or the nearest medical facility being far away. This time pressure builds tension as the reader hopes he'll make it in time.
Writers create tension by showing Sonic's pain and struggle. For instance, if he's trying to run but the injury stops him, it builds tension. Also, when his friends are worried about him, like Tails panicking as he tries to figure out what's wrong with Sonic, that adds to the tension.
One way is through the reactions of the other characters. If the village leaders start to question whether Naruto can still be a useful ninja, it creates tension. And if his friends are divided on how to help him, that also adds to it. Another method is by introducing new threats that specifically target Naruto because of his weakened state due to his breathing problem. Maybe there's a group that wants to take advantage of his vulnerability.
Writers create tension by making Clint's injury really severe. For example, if he's poisoned, the readers will be on edge wondering if he'll survive. Also, showing the Avengers' desperation to save him adds to the tension.
Writers create tension by putting characters in dangerous situations. For instance, they might describe a demigod being chased by a horde of mythical creatures through the forest of Camp Half - Blood. The fear of the unknown and the immediate danger builds tension.
One way is through pacing. They slow down the story when Naruto is at his weakest, making every moment count. They might also use flashbacks to show what Naruto has to live for, like his friends and his dreams for the village. This makes the readers more invested in his survival. And they introduce unexpected twists, like a false hope of recovery that turns out to be a trap or a new threat emerging just when it seems Naruto might be saved.
Using the emotional bond between Okabe and his friends can create tension when he's hurt. If Okabe is in a coma after getting hurt, his friends' reactions like Mayuri's desperate attempts to reach him through his subconscious or Kurisu's scientific efforts to find a cure while also being emotionally distraught can make the readers feel the tension. The writer can also play with the idea of time limits, like Okabe has only a certain amount of time to recover before something worse happens, which adds to the sense of urgency and tension.