Another plot could be a backstory exploration. Maybe they were separated at a young age due to some villainous plot against their family. As the fanfiction unfolds, they gradually find out about their true relationship. This could lead to a series of events where they try to reunite their family or seek revenge on those who separated them.
One interesting plot could be that Deku and Shigaraki, as brothers, are on opposite sides at first. But then they discover a common enemy that forces them to work together. This would involve a lot of character development as they have to overcome their differences. For example, Deku's belief in heroism and Shigaraki's hatred for the hero society.
To write their relationship realistically, you need to consider their personalities. Deku is kind - hearted and determined, while Shigaraki is more cynical and vengeful. So their interactions would be full of tension. For example, if they have an argument, Deku might try to reason with Shigaraki using his ideals, but Shigaraki would likely mock or reject them.
Another plot might involve the older Deku being from an alternate timeline. He shows the younger Deku different ways he could have developed his skills and relationships, which makes the younger Deku reevaluate his own path as a hero.
In the manga, Deku eventually defeats Shigaraki after a long and challenging struggle. The fight showcases Deku's growth and determination.
One interesting plot could be their journey of building a family together. They might face challenges like how to balance their hero duties with family life. For example, they could struggle with taking care of a child while also being on call to save the city.
One main theme is the concept of family. Since they are brothers in the fanfiction, it explores what family means to them, whether it's loyalty, protection, or something else. Another theme is the struggle between good and evil. Izuku is on the hero side and Shigaraki on the villain side, so there's this constant tug - of - war between their ideologies.
Another theme is the exploration of their differences. Shigaraki represents chaos and destruction while Deku represents hope and heroism. Fanfics usually explore how these two opposing forces interact and influence each other. For example, in some fanfics, they start to understand each other's perspectives better as they spend more time together.
One possible plot could be that Deku is mind - controlled to fight against his friends. His friends then have to figure out a way to break the mind control without hurting him. Another plot might involve the villain using Deku's mind - controlled state to gain access to secret hero information.
Another plot might involve them teaming up against a common enemy. Maybe a dark wizard is targeting them because of their combined magical abilities and they have to use their brotherly bond to overcome the threat. They could learn new spells together and support each other in battles.
One great 'Shigaraki x Deku' fanfic is 'Unlikely Bonds' which explores a unique friendship-turned-something -more between them. It delves deep into their complex characters and how they might interact in different scenarios outside of the main plotline.
One interesting plot could be Ash and Gary teaming up against a powerful new villain in the Pokemon world. They might put aside their rivalry and combine their skills and the unique abilities of their Pokemon to save the day.