Well, if Izuku gets the Hero Killer's quirk in fanfiction, he might face a lot of internal conflict. On one hand, his original goal of being a hero is all about saving people with a smile. But the Hero Killer's quirk is more about punishing those who are 'false heroes'. Izuku would have to struggle with how to use this new power in a way that aligns with his values. Maybe he'd try to reform the quirk's nature, using it to expose real villains who are hiding among the heroes instead of attacking heroes directly.
If Izuku got the Hero Killer's quirk, it could change his relationships significantly. His friends might be a bit wary of him at first. For example, Bakugo could see this new quirk as a sign of Izuku becoming more 'edgy' and might even be more competitive or hostile. However, some like Ochaco might try to understand Izuku's situation and help him come to terms with this new power. And in the hero community, he'd likely be under a lot of scrutiny. Some heroes might see him as a potential threat, while others might hope he can use the quirk for good.
It would make his hero journey much more complex. He'd have to constantly prove that he's not going to use the quirk in the wrong way. The public might be skeptical of him at first. But if he can show that he's still the same Izuku at heart, just with a new tool to fight villains, he could win them over.
There are also fanfictions where Izuku's quirk has a hidden aspect. Maybe his connection to One For All unlocks memories or abilities from the previous users in a more profound way. For instance, he might be able to access the combat knowledge of the past users directly, almost like having an in - built combat instructor guiding his every move.
Well, if Izuku had a quirk in a fanfiction, he might be an even more formidable hero. He could have a quirk that combines elements of his original quirkless determination and a newfound power. For example, maybe he has a quirk that allows him to enhance the quirks of those around him while also having his own unique ability, like super strength. This would change the dynamic of his relationships with his classmates. He wouldn't be the underdog in the same way, and might take on a leadership role more quickly.
In fanfiction, if Izuku was hit by a love quirk, he might start acting in a very affectionate way towards a particular character. For example, he could become overly protective or constantly seek the person's attention. His normal shy and reserved self might be replaced with a more forward and love - stricken version.
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.
He might lose his control over his own quirk for a while. Since his quirk is erasing others' quirks, if he's hit by a strange quirk, it could disrupt his own quirk's function.
It might also change his relationships with other characters. His friends could be both amazed and a bit envious. And his enemies would start to see him as an even greater threat. For example, Bakugo might feel more pressured to compete with Izuku who now has an additional powerful quirk.
One possible plotline could be that Izuku has a quirk that is initially very weak but has an unexpected growth potential. He might struggle to control it at first, causing some chaos at school. For example, if his quirk was related to telekinesis but he could only move small objects, and every time he got excited, things would start flying around randomly. His friends would have to help him learn to control it, and this would strengthen their bonds. Another plotline could involve a quirk that is considered 'evil' in society, like a quirk that can manipulate shadows in a way that seems menacing. Izuku would then have to prove that he can use it for good, facing discrimination and misunderstanding along the way.
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.
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.