Well, there are fanfictions that imagine Kankuro in alternate universes. In one, he could be in a world where puppets are sentient beings and he has to deal with the ethical and moral implications of using them. Another might be a story where he is part of a traveling circus troupe that uses puppets in their shows, and he has to use his skills to protect the troupe from bandits. There could also be a fanfic where Kankuro is the main character in a love story, perhaps with a character from another village.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). They have a wide variety of fan - created stories, including many about Kankuro from Naruto Shippuden.
Well, a common pairing is Kankuro and Sasuke. Sasuke's brooding and powerful nature can be an interesting match for Kankuro. The two could be pitted against each other initially and then develop feelings over time. Also, Kankuro and Neji have been paired in some fanfictions. Neji's calm and composed self paired with Kankuro's more flamboyant personality can make for some unique stories. Additionally, Kankuro and Kiba is a pairing that exists. Kiba's wild side and love for his dogs combined with Kankuro's puppet skills can lead to some fun and exciting yaoi fanfiction scenarios.
A frequent theme is the exploration of the forbidden. In the context of Naruto Shippuden, yaoi relationships involving Kankuro can be seen as going against the norm. So, fanfictions might focus on how he deals with this. There could also be themes related to family reactions. How would his family, like Gaara, react to his relationship? It adds an extra layer of drama. Additionally, the theme of perseverance in love is common. Kankuro and his partner might face numerous obstacles, but they persevere in their relationship, showing the strength of their bond.
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.
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.
I'm not sure specifically about 'lemon' fanfiction (which often implies inappropriate or adult - themed content). However, there are many great fanfictions about Kankuro and Temari that focus on their sibling relationship, their growth in the Naruto universe, and their interactions with other characters. You can try looking on popular fanfiction websites like FanFiction.net or Archive of Our Own and search for their relationship without the 'lemon' aspect.