One common theme is power comparison. For example, in crossovers with superhero universes, it's about how Sakon's power stacks up against the superpowers of the heroes. Another theme is cultural clash. When Sakon crosses into a very different world like the one in Harry Potter, his different upbringing and values collide with the new world's culture.
Kankuro could use his puppet - making skills to his advantage. He could create puppets that are resistant to the elements in the One Piece world, like water - proof puppets since there are a lot of sea - related challenges there. Also, he could make puppets that can fly to deal with the various islands and different terrains.
One idea could be that Sakura uses her medical ninjutsu to heal Kankuro after he gets seriously injured in a battle against a powerful enemy. She has to overcome various challenges like limited supplies and the unique nature of Kankuro's puppet - related injuries.
A good Sakon crossover fanfiction to check out is 'Sakon in the Harry Potter Universe'. Here, Sakon enters the magical world of Hogwarts. His non - magical but combat - based abilities make for an interesting contrast to the wizards and witches. He has to figure out how to survive in a world where magic is the norm. Another interesting one is 'Sakon's Encounter with the Powerpuff Girls'. It's a fun and light - hearted crossover where Sakon's serious nature clashes with the bubbly and cute Powerpuff Girls.
Sakon and Ukon could develop from being ruthless and self - centered to more empathetic characters. For example, Naruto's positive attitude might start to rub off on them, making them question their previous way of life.
One great 'Kankuro x Reader' fanfiction is 'The Puppeteer's Heart'. It beautifully captures Kankuro's complex personality. The story starts with the reader accidentally stumbling upon Kankuro's puppet - making workshop. From there, a slow - burning relationship develops. It's filled with moments of Kankuro being both mysterious and endearing.
A plot twist could be that the method Sakura uses to heal Kankuro has an unexpected side effect. For example, it gives him a temporary boost in his puppet - using abilities that he has to quickly learn to control.
One plot could be that Kankuro falls for a healer in the village. She mends his wounds after a battle. He is attracted to her gentle nature. They spend time together as she teaches him about herbs and he shows her his puppets. Their relationship blossoms from there.
One possible plot could be Naruto discovers he has the Ukon Sakon Genkai in a moment of extreme danger. He then has to quickly learn to control it. Maybe at first he struggles with the dark aspects of this power, but eventually he masters it and uses it to defeat a powerful enemy.
At first, Naruto might be a bit confused and scared about having this Genkai. But as he explores its abilities, his confidence would grow. He could use the unique powers of the Ukon Sakon Genkai to his advantage in battles, and this would make him a more formidable ninja. His relationships with his friends might also change. Some might be in awe of his new power, while others might worry about him. Naruto would have to work hard to assure them that he's still the same Naruto at heart.