Perhaps an ancient artifact in the MHA world has the power of the Naruto toads sealed within it. A villain discovers it first but a young hero - in - training manages to steal it away. Once in their possession, they unlock the toad quirk. They would then need to train hard to master it, just like Naruto did. They could call on the toads for help in battles, use their strong physical attacks and even learn some of the toad - related ninjutsu, adapting it to fit the rules and physics of the MHA world.
They would be very powerful. Just like Naruto can summon giant toads, this character could summon toads in the MHA world. They could use the toads as mounts or have them fight alongside. For example, they could have a toad use its tongue to grab villains and hold them in place.
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.
Tsuna's quirk, if we assume his Dying Will Flames are his quirk in the MHA universe, would likely be classified as an emitter type quirk. He could use his X - Burner attack as a long - range offensive move against villains. His hyper intuition could also be a part of his quirk, allowing him to predict his opponents' moves in battle. This would make him a valuable asset in hero teams, especially in complex battles where strategy is key.
He could have a quirk like 'Enhanced Intellect', which would further boost his already incredible detective skills. This would make him able to analyze situations even faster and come up with strategies on the fly.
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.
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 super - speed regeneration. In the original Naruto series, he has a great deal of stamina and the ability to heal relatively fast. But with this quirk, he could recover from even the most severe injuries in seconds. This would mean he could keep fighting no matter how badly he was hurt, and his enemies would find it extremely difficult to defeat him.
One way is through self - sacrifice. If the character uses their evil quirk to save a lot of people at great personal cost, it could be a step towards redemption. For example, if their quirk is something like mind - control and they use it to stop a powerful villain who is about to destroy a city, but in the process they lose their own ability to use the quirk. Another way is by showing remorse and actively trying to make up for their past actions. They could start doing volunteer work in the community, using whatever skills they have (even if related to their quirk in a non - evil way) to help others.