One great Izuku quirkless fanfiction is 'A Different Path'. It shows Izuku finding his own way to be a hero without a quirk through sheer determination and intelligence. He uses his knowledge of hero strategies and martial arts to hold his own against quirk - users.
In fanfiction, the relationship between quirkless Izuku and Jirou can be really interesting. They might bond over Izuku's determination despite not having a quirk. Jirou could be drawn to his tenacity and unique perspective. For example, Izuku might help Jirou with her insecurities about her quirk, and in return, Jirou could support Izuku in his battles, not just physical ones but also the mental battles he faces as a quirkless hero - in - training.
The idea of Izuku being quirkless is appealing because it's a story of the underdog. People love to see someone who is at a disadvantage rise above. In the original story, Izuku has a quirk in the end, but in fanfiction, keeping him quirkless allows for a different exploration of his character. It shows his tenacity and his ability to find solutions outside of the norm.
Often, the theme of acceptance is strong. Izuku has to deal with a world that sometimes doesn't accept quirkless individuals as heroes. Jirou can play a role in making him feel accepted and valued. And vice versa, Izuku can accept Jirou for who she is, quirks and all. This mutual acceptance can lead to a deep emotional connection between them, which is often explored in fanfictions.
In this type of fanfiction, the plot might start with Izuku being bullied as usual because of his quirkless state. Toga witnesses this and for some reason, feels a connection. Maybe she was bullied in the past too, for her abnormal quirk. Toga then decides to protect Izuku from the bullies. Izuku is shocked but also grateful. As time passes, they start to communicate more. Izuku shares his dreams of being a hero even without a quirk, and Toga starts to question her own villainous ways. Their relationship develops as they influence each other's views on life and society.
One possible story could be Izuku proving himself in combat training without a quirk. He could use his intelligence and strategic thinking to outwit his classmates with quirks. For example, he might study their weaknesses in advance and set up elaborate traps during the training exercises.
Their relationship could develop slowly. At first, Toga might be curious about Izuku because he's so different from the others she's known. Izuku would be cautious but also see that Toga is more than just her villainous reputation. They might start by having small conversations, gradually learning about each other's hopes and fears. As they spend more time together, they could develop a deep bond. Izuku might inspire Toga to be a better person, and Toga could give Izuku the confidence he needs in a world that doesn't believe in the quirkless.
Izuku could develop his own unique fighting style. He combines his knowledge of hero strategies and his physical abilities. Maybe he invents gadgets like Batman, which give him an edge in battles against quirk - users. This would make him stand out as a badass hero in the fanfiction world.
One interesting quirkless oc fanfiction could be about an ordinary person in a world of quirks who uses their wits and determination to outsmart villains. For example, they might study the weaknesses of quirk - using opponents and use strategic planning to achieve victory.
First, give your quirkless oc a strong personality. Maybe they are extremely brave or have a great sense of humor. Second, define their goals clearly. For instance, they could aim to be the best athlete in a world where most athletes use quirks to enhance their performance. Third, think about their backstory. Were they bullied for being quirkless? Or did they grow up in a loving family that supported them despite their lack of a quirk?