In 'deku meets future deku fanfiction', perhaps the future Deku warns the present one about upcoming threats. He could tell him about villains he'll face in the future and how to defeat them. This would give the present Deku an edge in his battles and also in his growth as a hero.
One possible plot could be that Villain Deku is on a mission to undermine the hero society and crosses paths with Hero Deku. They engage in a fierce battle where Villain Deku taunts Hero Deku about his ideals. In the end, Hero Deku manages to get through to a small part of Villain Deku's conscience, leaving him with some doubts about his villainous path.
One possible motive could be a long - held grudge that has festered over time. Maybe Bakugou's constant bullying in their past finally pushed Deku over the edge. Another could be some sort of mind - control or dark influence that made Deku act out of character.
Maybe Naruto discovers modern - day technology in a hidden shinobi village that has been secretly researching it. He could then try to integrate this technology into the ninja world, like using smartphones to communicate during missions instead of traditional methods. This would likely cause a stir among the more traditional ninja.
The plot could be that Deku is doing some sort of experiment in the school lab when something goes wrong. A chemical reaction or a malfunctioning device causes him to turn into a baby. All Might hears about it and comes to visit. He feels a sense of responsibility as Deku is his successor. The other students are both amused and worried. They start to learn about taking care of a baby, like feeding, changing diapers, and making sure he sleeps well. Meanwhile, the teachers are researching how to reverse the transformation, and they suspect that it might be related to some ancient quirk theory that they need to dig deeper into.
Well, one possible plot could be that Deku accidentally drinks a strange potion created by a villain. This potion has the side - effect of changing his gender to female. At first, he's shocked and confused. But then, he realizes that he can use this new form to his advantage in hero work. For example, he might be able to infiltrate a female - only villain group more easily. He also has to deal with his friends' reactions, some are surprised while others are supportive and help him adjust to his new body while still being a hero.
Well, it could be that Bakugou finally realizes his true feelings for Deku after a long time of denying them. Maybe there was a big event that made him see Deku in a whole new light. For example, Deku saved Bakugou's life in a dangerous battle. And then Bakugou, who is usually so tough on the outside, struggles with his new - found emotions and finally musters up the courage to confess to Deku.
Well, one possibility is that Toga kidnaps Deku to get closer to the heroes. Maybe she thinks she can use Deku as a bargaining chip to make the heroes do something for her. For example, she might demand the release of some of her villain friends from prison.