In the official story, Izuku's quirk development is a long and arduous process tied to inheriting One For All. In fanfiction with the black lightning quirk, his development might be more about controlling the raw power of the lightning. For instance, he may have to learn how to focus the lightning into precise strikes rather than building up strength like with One For All.
The black lightning quirk in fanfiction could give Izuku a more distinct and flashy appearance compared to his use of One For All. With black lightning crackling around him, it's a much different visual than the green - energy - based manifestations of One For All. This could also affect how others perceive him, making him seem more mysterious or dangerous in the fanfiction world.
Well, his original quirk is One For All which is more of a power - storing and transferring quirk. The black lightning quirk in fanfiction is likely more offensive - oriented. It can be used for direct attacks like shooting bolts of black lightning at enemies.
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.
The Gamer Quirk also changes Izuku's relationship with others. He can now offer unique insights based on his quirk. For instance, he might be able to analyze a villain's attack pattern like it was a boss fight in a game. His friends and allies can then use this information to their advantage. This makes him a valuable member of any team. At the same time, it also means that he might be seen as a bit of an oddball because his thinking is so different from the norm. But overall, it helps him form deeper connections with those who understand and appreciate his quirk.
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 relationship with his mother could become more complex. She might be worried about his new nature and try to protect him more. With his friends, like Bakugo, they might initially be scared or distrustful when they find out about his quirk.
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.
In some fanfictions, Izuku's black lightning quirk could have unique side effects. Maybe it drains his energy in a different way than normal quirks, leading to him having to find creative ways to manage his power usage during battles. This could add a whole new layer of complexity to his character development.
In fanfiction, Izuku often has unique ways to cultivate his quirk. One common scenario is that he focuses on intense physical training. Since his body was initially not as strong as it could be to handle his powerful quirk, he might do a lot of strength - building exercises like weightlifting and running. This not only helps him control his quirk better but also increases his overall combat capabilities.
The 'Mentor Figure' trope is also quite common. Given the power of the lightning quirk, Izuku usually needs someone to guide him. This could be an older hero or even a mysterious stranger. The mentor helps him understand his quirk better, trains him in combat techniques that are specific to his lightning - based powers, and also gives him moral support. This trope adds depth to the story as it shows Izuku's growth not just in terms of power but also in character.
One great Izuku with Lightning Quirk fanfiction is 'Lightning's Ascent'. In this story, Izuku discovers his unique quirk early on and has to learn how to control it. It's really exciting as it shows his journey from being an outcast to a hero in training with a powerful and rare quirk.