One popular fanfiction concept could be Deku proving his worth without a quirk in the Bakudeku relationship. Maybe he uses his intelligence and strategic thinking to assist Bakugo in battles. For example, he could analyze opponents' weaknesses and come up with battle plans that Bakugo can execute. This would show that even without a quirk, Deku is an important part of their duo.
A common theme is the underdog story. Deku, being quirkless, is the ultimate underdog. He has to fight against the odds and the prejudice of a world that values quirks highly. This makes for a very compelling story as he overcomes these obstacles, often with Bakugo by his side or as his motivation.
In fanfiction, a quirkless Deku often has to rely more on his wits. Canon Deku got One For All, but in fanfic, he has to find other ways to be strong. For example, he might study different fighting styles more intensively.
One great quirkless Deku fanfiction is 'The Quirkless Hero'. In this story, Deku uses his intelligence and intense training to outwit villains. He forms an alliance with other underdog characters. It's really inspiring to see how he overcomes the odds without a quirk.
Perhaps Deku discovers a dark secret about the origin of quirks and decides that the world would be better off without them. So, he starts a villainous campaign to eradicate quirks. He could form an alliance with other outcasts who have been mistreated due to their lack of quirks or abnormal quirks.
His relationship with his mother would be extremely strained. She might be in denial about her son becoming a villain and try desperately to bring him back to the light. With his former friends like Bakugo, it would turn into a bitter rivalry. Bakugo, who used to bully him, now has to face a much more dangerous and calculating Deku.
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.
One great izuku quirkless fanfic is 'A Quirkless Hero's Ascent'. It shows Izuku's journey without a quirk in a really unique way, with him relying on his intelligence and sheer determination. Another is 'Quirkless but Unstoppable'. This one focuses on Izuku training in secret and developing skills that even those with quirks envy.
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.
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.