One idea for Izuku Midoriya's quirk in a Dark Souls - inspired fanfiction could be 'Soul Link'. This quirk would enable him to form a link with other people's souls. He could use this link to either heal them by sharing his own energy (similar to Estus Flasks in Dark Souls), or he could disrupt their soul's energy, causing them to be weakened or even stunned. It could also work as a way for him to sense the presence and intentions of others, as he would be attuned to their souls. This quirk would give him a unique advantage in battles and also in forming relationships with other characters in the fanfiction.
In a fanfiction with a Dark Souls - inspired quirk for Izuku Midoriya, his character development would be a journey of self - discovery. For instance, if his quirk was 'Grim Resolve', which gives him a boost in strength and speed when he's in a near - death situation (similar to the 'hollowing' concept in Dark Souls), he would have to learn when to push himself to that limit. He would start off as a naive and somewhat idealistic character, but as he experiences the harshness of his quirk and the battles he has to fight, he would become more cynical. But at the same time, he would also find a deeper sense of purpose. His interactions with his classmates and mentors would change as they try to understand and help him with his unique quirk, and he would grow into a more complex and mature character as a result.
It could be developed by having Izuku practice and gradually increase the duration of his time - freezing ability. For instance, at first, he can only freeze time for a split second, but with training, he can hold it for a few seconds, which makes a huge difference in combat.
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.
Izuku's character development in this fanfiction could be quite complex. With a dark matter quirk, he may initially be ostracized or feared by some due to the unknown and potentially dangerous nature of his power. This could lead to him feeling isolated, but it also might fuel his determination to prove that he can be a great hero. As he trains and explores his quirk, he would learn about its limits and potential. His moral compass could also be tested, for instance, if the dark matter has some unforeseen negative effects. Through these experiences, he would gradually transform from a somewhat naive boy into a more mature and self - assured hero, all while grappling with the implications of his unique quirk.
His relationship with All Might would also be affected. All Might might be more cautious about Izuku's quirk as it's very powerful and could potentially disrupt the fabric of time. Izuku, on the other hand, could use his quirk to go back and learn more about All Might's past, which could strengthen their bond as he gains a deeper understanding of his mentor. However, it could also create a rift if Izuku discovers something in the past that he doesn't like about All Might's actions.
One implication could be a change in his relationships. His friends might be initially afraid or distrustful. For example, Bakugo could see this as a sign of Izuku being a real threat now, instead of just a rival. Also, the teachers at UA might have to deal with a whole new set of problems regarding Izuku's training and control of his dark 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.
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.
One idea could be that Izuku discovers his time manipulation quirk late. For example, during a really tough battle against a powerful villain where all seems lost. He accidentally activates the quirk and rewinds time just enough to change the outcome. This could lead to a whole new arc of him training to control this powerful and dangerous quirk.
In fanfiction, Izuku's strength quirk can be depicted in various ways. Some writers might give him a super - strength quirk that allows him to lift extremely heavy objects. For example, he could be able to stop a speeding train with his bare hands. This gives a new and exciting dynamic to his character, as it deviates from his original quirk in the official story.