The relationships would be completely different. Instead of the usual friendships and rivalries, there would be a lot of hostility. For example, his relationship with Bakugo would be even more strained. Normally, there's a complex dynamic between them, but with Izuku hating everyone, it would be all - out enmity.
Another aspect could be the general discrimination in the BNHA society. The fact that society is so focused on quirks and those without are often looked down upon might have made Izuku bitter. He could be hating everyone because he sees the society as a whole being corrupt and unkind, not just the individuals who directly wronged him.
In fanfics, an emotionless Izuku can change the story a great deal. For instance, his decision - making process is different. He doesn't act out of anger or excitement like the regular Izuku. This can lead to different battles and outcomes.
Well, in the original, Hermione is like family to the Weasleys. But in this fanfic, it completely flips. Their interactions would become tense and full of hostility instead of the warm and friendly ones we know.
In a fanfic where All Might adopts Izuku, Izuku's life would take a different turn. He'd be part of All Might's family, which means he'd be exposed to a different way of life. All Might could teach him not just about heroics but also about life values. This would shape Izuku into a more well - rounded person. Izuku would also have a stronger support system. When it comes to his quirk, All Might could help him understand and control it better. He might even be able to use All Might's influence to get better equipment for Izuku. All in all, this adoption would enhance Izuku's story in many positive ways.
A plot for this fanfic could be that Izuku discovers his sand quirk at a crucial moment during a battle. From then on, he starts to train intensively with it. The story could focus on his growth as a hero with this new quirk. He might have to participate in special training sessions designed for quirks like his. There could be a tournament arc where he shows off his new abilities. However, he also has to deal with the fact that some people are skeptical of his sudden change in quirk, and he has to prove himself not only to his enemies but also to those who doubt him.
With his classmates, some might be scared of Izuku. They've known him as a kind - hearted person, but the All for One quirk has such a dark reputation. However, some like Ochaco might try to understand him better and support him through his journey with this new quirk. His relationship with the teachers would also be under scrutiny. They would need to ensure that Izuku doesn't use the quirk for evil purposes, which could lead to a lot of extra monitoring and a sense of unease in their interactions.
His relationship with All Might would become extremely complicated. All Might, who passed on One For All, would be shocked and perhaps a bit disappointed that Izuku now has the All For One quirk. He might question his decision to choose Izuku as his successor. With Bakugo, their rivalry could take a different turn. Bakugo might be both envious and afraid of Izuku's new power, leading to more intense confrontations. And with his friends like Iida and Ochaco, they might be initially hesitant around Izuku, not knowing if he can still be trusted with such a villainous - associated quirk.
If the All for One power was introduced to the Naruto universe, the power dynamics would be severely disrupted. Characters who were previously at the top in terms of power, like Naruto or Sasuke, would have to reevaluate their positions. The ability to steal and transfer powers would create a whole new level of threat.
In the fanfiction, Izuku may start to undermine All Might's actions. He could try to expose any flaws or wrongdoings of All Might. Their relationship goes from one of idolization and guidance to one of opposition. Izuku no longer looks up to All Might and may even try to bring him down. For example, he could spread rumors or try to find evidence against All Might if the story goes in that direction.
One great 'bnha cool izuku fanfic' is 'Deku: The Prodigy'. It shows Izuku in a really cool light, with unique character development and exciting plot twists. Another one could be 'Izuku's Ascent' which focuses on his journey to becoming an even greater hero than in the original story, with some really cool new powers and abilities.