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.
One example could be a fanfiction where Okabe gets physically hurt during an experiment gone wrong. Maybe he's trying to adjust the time - leap machine and there's a malfunction that causes an electrical shock, leaving him injured and his friends having to deal with the consequences while also trying to fix the situation. Another could be in a scenario where he's caught in the middle of a conflict between different factions vying for control of the time - travel technology, and he gets hurt as collateral damage.
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.
In fanfiction, Okabe's mad scientist persona can be further developed. Maybe he's even more eccentric or has some new quirks that are specific to the fan - created story. It could show his thought process in more detail when it comes to his feelings for Makise.
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.
One popular theme is the exploration of their complex relationship in different timelines. Since Steins Gate has a lot to do with time travel and alternate realities, fanfictions often play with how Okabe and Makise's relationship develops or changes in these various situations.
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.
By showing the helplessness of his teammates. If they don't know how to save Lance, it adds to the tension. They might be scrambling around, trying different things but nothing seems to work.
Writers create tension by emphasizing the severity of Captain America's injury. If it's a physical injury, they might describe the blood, the pain, and his struggle to even move. For example, if he has a broken leg, the way he tries to stand up and keep fighting can build tension. The reader is on edge, wondering if he can actually do it.
In Steins; Gate Zero, Mayuri slapping Okabe could be a moment of shock or an attempt to snap him out of a certain state. It might be a way to bring Okabe back to reality from his complex thoughts or actions.
Another way is to have the character's upset tummy be a result of something they did wrong, like stealing food and now they are suffering the consequences. This creates an internal conflict within the character as they deal with both the physical pain and their guilt, which adds to the overall tension of the fanfiction.