One interesting concept could be seeing how characters adapt to new quirks. For example, if Midoriya had Bakugo's Explosion quirk, his usually timid nature might contrast sharply with the aggressive nature of the quirk. He would have to learn to control his emotions in a different way to master it.
One common theme is identity exploration. When the characters' genders are swapped, they often have to re - evaluate who they are and how they fit into the world. Another theme is relationship changes. Their interactions with friends, family, and love interests can be very different. For example, a male - to - female swapped character might have a different dynamic with a male friend now.
Todoroki is also a popular choice. His complex backstory and powerful quirk make him an interesting candidate for quirk swaps. Swapping his quirk with someone like Momo, who has a creation quirk, could lead to really unique storylines.
One cool quirk idea could be 'Shadow Mimicry'. The user can blend into any shadow and move freely within the shadow realm, also being able to mimic the actions of those whose shadows they are in. It gives a lot of stealth and surprise attack possibilities in a fanfiction.
Well, there's 'The Swapped Quirk World of My Hero Academia'. In this fanfiction, not only are the genders swapped but it also delves deep into how the swapped - gender characters interact with society and their fellow heroes and villains. It really gives a fresh perspective on the whole My Hero Academia universe. Also, 'Gender - Flipped Quirk Dynamics' is quite good as it focuses on the changes in the quirk relationships between characters due to the gender swap.
His quirk could be something like 'Limitless Rage - Transformation'. When he gets angry, his body transforms into the Hulk form, growing in size and strength. The angrier he gets, the more powerful he becomes, similar to how it works in the Hulk's original story.
One idea for a Deku's Quirk fanfiction could be exploring what would happen if Deku's quirk manifested in a different way. For example, instead of having to gradually control One For All, he suddenly has full mastery from the start. This could lead to a very different story arc where he is immediately seen as a top - tier hero - in - training, causing envy and admiration in equal measure among his classmates.
One idea could be a fanfiction where Deku's quirk suddenly mutates. Instead of just having One For All, he starts to develop an additional power related to it, like the ability to share a fraction of One For All's power with his friends temporarily to boost their own quirks in a time of great need.
First, consider their motivation for using the Copy Quirk. Are they using it to become the best hero? Or maybe to prove themselves to someone? For example, if they want to be like their idol hero, they might copy only the quirks of that hero at first. Then, think about the limitations of the quirk. Maybe they can only copy a quirk for a short time, so they have to strategize when to use it. This would force them to study different quirks and opponents carefully.