The system might also give the reborn character the ability to transform their body in unique ways. For example, they could use it to create a hybrid form that combines the powers of different races. This new form could be extremely powerful and give them an edge in combat. Along with this, they could use the system to learn ancient magic or techniques that have been lost in the High School DxD world. With these new powers, they could start their own faction or school within the world, changing the power dynamics completely.
One interesting plot development could be the main character using the system to unlock unique powers that are not present in the original DxD universe. For example, they might be able to combine different sacred gears in unexpected ways, creating entirely new abilities that give them an edge in battles against both devils and angels.
One idea could be that Superman, with his powers, becomes a sort of protector in the High School DxD world. He could use his super strength to stop any over - the - top fights that break out between the different factions. And his heat vision might come in handy when dealing with some of the more dangerous magical threats that lurk in the shadows of the school.
In a Gohan in High School DxD fanfiction, Gohan could be a special exchange student. He has to balance his studies and his new life in this strange world filled with devils and angels. He might start a martial arts club in the school, which becomes popular. But his real purpose could be to find a way to bring peace between the different factions, using his Saiyan abilities and kind heart.
One possible plot could be Sans getting involved in the supernatural battles in the High School DxD universe. Maybe he uses his unique abilities from his original game to help out the main characters in a fight against a powerful enemy. For example, his bone attacks could be a useful addition to the combat arsenal in that world.
One interesting plot point could be Naruto using his Rinnegan powers to navigate the complex social hierarchy in High School DxD. For example, he could use the Preta Path to absorb the magic attacks of the devils or angels, which would make him a formidable force in that world. Another point could be his struggle with the ideologies of the different factions. Since he has the mindset of Pain in some ways, he might see the power struggles in High School DxD as similar to the shinobi world's and try to bring about 'peace' in his own way, which could lead to conflicts with the existing power structures. Also, his relationships with the female characters in High School DxD could be an interesting aspect. Given Naruto's character and the unique nature of the female characters in High School DxD, there could be some unique romantic or platonic relationships that develop.
A plot could involve Kaido being sent on a special mission by the Devil King to infiltrate a human school. During this, he starts to develop real friendships with the characters in High School DxD. His initial motives are questioned as he begins to care more about his new friends than his mission, creating a lot of internal conflict.
One idea could be a Dragonborn character arriving in the High School DxD world and having to adapt to the unique school and supernatural environment. They might use their dragonborn abilities to stand out in the Rating Games.
One plot idea could be that Naruto is summoned to the High School DxD world by a powerful magic user who mistakes him for a powerful demon. Once there, Naruto has to prove that he is not a threat while also trying to find a way back home. Along the way, he befriends some of the students at the school and helps them with their own problems, like protecting the school from a sudden attack by a group of rogue devils.
A plot could involve the Annihilation Maker creating a device that can enhance or steal the powers of the characters in High School DxD. This device falls into the wrong hands, like a group of rogue exorcists who want to use it to purify all the devils and fallen angels. The main characters then have to race against time to retrieve the device from the exorcists. Along the way, they face many challenges and battles, and the Annihilation Maker has to use their skills to reverse the effects of the device if it has already been used on some of the characters.
Well, in 'high school dxd torture fanfiction', a plot could involve a character being physically tortured in a magical prison where the pain is amplified by dark magic. This could lead to the character having to find inner strength and allies to escape. Also, perhaps a character is tortured by being isolated from their friends and loved ones, which is a form of emotional torture.