Well, with a green fire quirk, Izuku would likely have to train in environments that can withstand fire. This means his training grounds would be more specialized. He might also need to study the chemical composition of his green fire to understand its properties better. For example, if it has some sort of special element in it that can be used against certain types of enemies. Training would also involve learning how to use the fire in different forms, like a thin stream for precision attacks or a large blast for taking on groups of foes. And he'd probably have to work on his endurance, as using the fire quirk might drain his energy quickly.
If Izuku has a green fire quirk, his training would be distinct in several ways. Firstly, he would need to practice heat resistance, as being close to his own green fire could be dangerous. He'd have to learn how to direct the fire accurately, which could involve a lot of target practice. His training would also be about conserving energy, as the green fire quirk might be energy - intensive. Maybe he'd have to develop a special diet or exercise routine to keep up his energy levels for using the quirk. Additionally, he'd need to learn how to combine his green fire with other skills, like his acrobatic movements, to create more effective combat strategies.
Well, Izuku's sentient quirk could make his training more challenging in some ways. Since the quirk has its own thoughts, it might not always agree with Izuku's training methods. There could be clashes between what Izuku wants to do and what the quirk thinks is best. This would force Izuku to find a compromise and develop new strategies for training that satisfy both him and his quirk.
One great example could be 'The Green Blaze of Izuku' where his green fire quirk is used in creative ways during battles. It might show him developing unique combat techniques that utilize the green fire's properties, like how it can be shaped into various forms to either attack or defend.
His training would likely start with basic control. He'd practice making small objects move up and down with different levels of gravity. For example, he might start with a pencil, trying to make it hover gently or drop quickly. Then he'd move on to larger objects like weights in the gym. He'd also do exercises to improve his reaction time when using the quirk, so he can quickly adjust the gravity in a fight.
His relationship with Bakugo would be very different. Instead of Bakugo looking down on Izuku for being quirkless, he might be jealous of Izuku's powerful fire quirk. This could lead to even more intense rivalries between them. With All Might, All Might might be more cautious in training Izuku as a fire quirk could be more dangerous to handle without proper control.
In 'The Healer of UA', Izuku's healing quirk is more complex. It requires him to concentrate and visualize the injury being healed. He can also transfer some of his own stamina to the injured to speed up the process. This makes his quirk not only about physical healing but also about his own sacrifice and determination.
Some characters might be immediately terrified. They could avoid Izuku or even try to drive him away. For example, classmates who don't understand his quirk might spread rumors about him.
In some fanfictions, Izuku might discover he has his father's quirk during a moment of extreme stress. For example, when facing a powerful villain that he couldn't defeat with his own quirk, suddenly a new power, which turns out to be his father's quirk, emerges.
His relationships with his friends would likely become more complex. If he starts using his time quirk to change things, his friends might not remember the original timeline, but Izuku would. This could create a sense of isolation for him as he holds memories that no one else does.
In many fanfictions, Izuku might unlock his quirk through intense emotional experiences. For example, a moment of extreme anger or determination could trigger it. Maybe seeing his friends in great danger and feeling a strong need to protect them could be the catalyst.
In some fanfiction, Izuku also experiments with different environments to cultivate his quirk. If his quirk is related to strength, he might try training in places with different gravitational forces. This forces his body and quirk to adapt, and in the process, he can discover new ways to use and develop his quirk.