One popular izuku system fanfiction could be those where he gains unique power systems that change the course of the story in the My Hero Academia universe. For example, some might have him with a system that rewards him for heroic deeds in unexpected ways, like unlocking ancient quirks.
One interesting izuku system quirk fanfiction could be where Izuku's system quirk allows him to access the powers of different heroes throughout history. He could use these powers in unique combinations to defeat villains in ways no one has seen before.
In certain fanfictions, the izuku system is a secret. This secrecy can strain his relationships as he has to constantly lie or be evasive about his sudden improvements. But when the truth comes out, it can either lead to a huge rift or a deeper understanding among his friends, depending on how the writer chooses to portray it.
In a fanfiction where Izuku's system quirk is very powerful, it could lead to some characters feeling inferior. However, his closer friends like Ochaco or Iida might see it as an opportunity for all of them to grow. They could train with Izuku to better understand his quirk and improve their own skills. On the other hand, villains would likely target him more, which could put a strain on his relationships as he tries to protect those around him from the danger his quirk attracts.
He would likely be more confident. Having the powers of the Human Torch gives him a new level of strength. So he might stand up straighter and be more assertive in his actions.
In many fanfictions, Izuku adapts by relying on his heroic spirit. He sees the similarities between his world and the Spider - Verse in terms of helping people. So he starts to work with the local heroes, like Peter Parker or Gwen Stacy. He learns from them about the different threats in the Spider - Verse and how to handle them. He also tries to incorporate his own fighting style from My Hero Academia with his new spider - based powers. For instance, he might combine his One For All power with his new spider - strength for more powerful attacks. This process of adaptation is really exciting to read about as it shows Izuku's growth in a new and different environment.
His friends like Ochaco could help. She might use her zero - gravity ability to assist in handling heavy parts during the construction. Also, Iida could be there to keep things organized and on schedule with his strict sense of order.
Bakugo is often a key character. In many fanfictions, Bakugo's reaction to Izuku's evolving quirk can range from envy to begrudging respect. Their relationship is always a central focus, with Bakugo either trying to outdo Izuku or having to come to terms with Izuku's newfound power.
Izuku would probably be terrified at first. After all, he's been kidnapped by villains. But then, his hero - like determination would kick in. He might start looking for ways to escape or at least resist their plans.
All Might often appears. Since he was Izuku's mentor, in time travel scenarios, he might be the one Izuku turns to for advice or assistance. Another common character is Bakugo. Their complex relationship can be explored further in time travel stories, like if Izuku goes back in time, he might try to change how Bakugo treated him in the past.