Often, a power - hungry character might betray Issei. In the world of the fanfiction, power is crucial. So, someone who wants more power than Issei may see him as an obstacle. They could betray him by stealing his power - up opportunities or even directly stealing his power if there's some sort of magic or ability transfer in the story. Also, a character with a hidden agenda related to the overarching plot of the fanfiction world, like a secret organization trying to control the balance of power between devils, angels and fallen angels, could use Issei and then betray him when he has served their purpose.
In some fanfictions, the plot device of a time - loop or alternate reality can lead to Sailor Moon getting hurt. In a time - loop scenario, she may keep repeating the same situation where she gets injured until she figures out how to break the loop. In an alternate reality, the rules may be different, and she may not have all her usual powers or allies, making her more likely to get hurt. Another aspect could be the introduction of a new, mysterious character whose actions or powers are not fully understood at first and end up harming Sailor Moon.
A frequently used plot device is the change in relationships. When Ichigo is sent to another dimension, his relationships with his friends back home are put on hold, and he forms new bonds in the new place. He might meet a mentor - like figure in this dimension who teaches him new combat techniques or ways to control his powers better. Another common one is the culture shock. The new dimension could have a completely different society, values, and ways of living, which Ichigo has to navigate. This can lead to some interesting character development as he learns and grows from these experiences.
A common plot element is the shock of betrayal. Issei is usually shown as a trusting character, so when he is betrayed, it's a huge emotional blow. Another element is his struggle to come to terms with it. He might question his own judgment and relationships. Also, often there is a part where he decides whether to seek revenge or forgiveness. For example, in some fanfictions, he initially wants revenge but then realizes that forgiveness might be a more noble path.
Miscommunication also plays a big role. In fanfiction, they might not fully understand each other's motives or goals. Jon may say or do something that Dany misinterprets as a threat to her rule, and she may respond in a way that further aggravates the situation.
One common plot could be Issei being betrayed by his friends in the Occult Research Club. Maybe they believe false rumors about him being a traitor to their cause. For example, an enemy might plant evidence that makes it seem like Issei is secretly working for a rival faction. Another plot could involve Issei being betrayed by a love interest. She might be forced to turn against him due to some dark magic or family pressure.
One common plot twist could be that Issei betrays his friends for power. Maybe he's lured by a powerful devil who offers him unimaginable strength on the condition that he turns against his comrades. Another could be a misinformation scenario where Issei is tricked into believing his friends have betrayed him first, so he retaliates.
One common plot device is the initial abduction scene, often filled with confusion and fear for the human. Another is the exploration of the alien ship, where the human discovers strange technologies and alien cultures. And the idea of communication barriers between the human and the aliens, which they have to overcome, is also very common.
A typical plot device is the discovery of rare Pokemon. In these fanfictions, the main character might stumble upon a very rare Pokemon, and this encounter could attract other characters or Pokemon, gradually forming the harem. Also, the mystery element, such as an unknown power or a hidden place related to Pokemon, can bring the harem members together as they explore and solve it. And of course, the training montages where the trainer helps the Pokemon in the harem grow stronger are quite common too.
Often in these fanfictions, a plot device is the existence of an alternate dimension. The Avengers could find a way to access this dimension where things didn't go wrong and bring back the good elements from there to fix their own world. Additionally, a Deus ex Machina - like event, such as a sudden, unexplained cosmic force that restores everything to normal, is sometimes used. However, this can be a less satisfying device as it doesn't really involve the characters' efforts as much. Another plot device is the power of teamwork being magnified to an extreme degree. The Avengers, by working together in a more perfect way than in the original story, are able to fix all the problems.
One common plot device is the 'accidental discovery'. For example, the protagonist might accidentally stumble upon a hidden vampire lair or a secret about a character's past. Another is the 'accidental transformation', like a human accidentally being turned into a vampire or a werewolf in an unexpected way. Also, the 'accidental meeting' of two important characters who were not supposed to cross paths can lead to a whole new set of events in the fanfiction.