Another great idea is a crossover with the "Naruto" world. Izuku could meet Naruto and the two could bond over their similar goals of becoming strong and protecting their friends. Izuku's quirk might be seen as a strange form of chakra - like power in the Naruto universe, and he could participate in ninja training and battles, using his quirk in creative ways.
One idea could be a crossover with the "Harry Potter" universe. Izuku could have his own quirk and attend Hogwarts, facing challenges in a magical world while also dealing with his normal quirk - related issues. Maybe his quirk could interact in unexpected ways with magic.
One idea could be that Izuku's time quirk allows him to reverse time for a short period during battles. So he can correct his mistakes and outwit his opponents. For example, if he made a wrong move in a fight against a villain, he could reverse a few seconds and choose a better strategy.
A possible plot could be centered around Izuku's struggle to control his Phoenix quirk. Since it's such a powerful and volatile quirk, he often loses control. This causes problems not only for him but also for his friends and the people around him. He then has to seek out an old, reclusive hero who once had a similar quirk to learn how to master it.
Another interesting plot idea is that Izuku's quirk evolution is tied to his emotions. When he experiences strong positive emotions like hope or love, his quirk becomes stronger and evolves in unexpected ways. For instance, it could manifest as a healing ability in addition to his existing powers. This would make his character development more complex as he has to learn to manage his emotions not just for his own well - being but also for the sake of his quirk evolution.
Another plot could involve Izuku being part of a secret society of heroes with vampire quirks. They have their own set of rules and ethics regarding using their powers, and Izuku has to learn to navigate this new world while still aiming to be a regular hero.
One of the coolest things about 'izuku crossover quirk fanfiction' is the world - building. Writers get to create unique settings by combining the My Hero Academia world with other well - known universes. This gives a fresh perspective on both worlds. And of course, seeing Izuku use his quirk in these new and strange environments, like in a post - apocalyptic world where his quirk might be used for survival in ways not seen before, is always exciting.
Well, perhaps Izuku's upgrade comes from his emotional growth. As he becomes more confident and self - assured, his quirk evolves. He might start to be able to transfer One For All's power to objects he touches, making them super - powered weapons. Or, he could gain the ability to share a fraction of his quirk power with his allies, enhancing their abilities in a fight.
One idea could be Izuku struggling to control the All for One quirk at first. He might accidentally absorb quirks he doesn't want, leading to chaos. For example, he absorbs a quirk that makes him grow extra limbs and has to figure out how to hide it. Another could be that villains target him more, thinking he'll be easy to corrupt with such a powerful quirk.
One idea could be that Izuku's quirk is related to time manipulation. He could use it to slow down time during battles, giving him an edge in combat. For example, he could dodge attacks with ease and plan his counter - attacks carefully.
One idea could be Izuku struggling to control his dragon quirk at first. For example, he might accidentally breathe fire during a normal school day, causing chaos. Another plot could involve him discovering unique abilities of his dragon quirk, like flying at high speeds or having super - strong scales for defense. Maybe he has to face a villain who has a quirk that is specifically designed to counter dragon - like powers, which would make for an intense battle.
One idea could be that Izuku's time quirk allows him to briefly freeze time during battles. This gives him an edge in strategizing and attacking his opponents when they are immobilized.