Yes, there might be such fanfictions out there. The idea of crossing over Naruto and One Piece universes in this way is quite creative. Some fanfiction authors like to explore unique character relationships and scenarios by bringing characters from different anime together.
One possible plot could be that Naruto, with his strong sense of justice, tries to reform Doflamingo's crew. He could use his ninja skills to train the crew members and make them more honorable fighters. Naruto might also face challenges from within the crew who are resistant to his new leadership style.
One interesting aspect is the clash of different power systems. Naruto has its chakra - based powers like ninjutsu and bijuu powers, while Doflamingo has his string - based devil fruit abilities in One Piece. When combined in fanfiction, it creates unique battle scenarios. For example, seeing how Naruto's Rasengan would interact with Doflamingo's string attacks.
One possible storyline could be that Naruto, through some strange dimension - hopping incident, ends up in the One Piece world. There, he witnesses Doflamingo's power and charisma from afar. Doflamingo's ability to control and manipulate situations might intrigue Naruto, who has always been about facing strong opponents. He starts to study Doflamingo's tactics and gradually becomes a fan, trying to incorporate some of Doflamingo's strategic thinking into his own battles, all while still maintaining his core values from the Naruto world.
Sure, in the world of fanfiction, Naruto might acquire Doflamingo's abilities. Fanfiction often allows for unexpected and unique combinations of powers and characters, opening up endless possibilities for imaginative storytelling.
One great Naruto Doflamingo fanfiction is 'The Unlikely Alliance'. It features an interesting plot where Naruto and Doflamingo are forced to work together due to some strange circumstances in a parallel universe. Another one is 'Doflamingo's Redemption Arc in Naruto World' which gives Doflamingo a chance at redemption in the Naruto setting.
Well, it could be through some special training or a unique encounter. Maybe he stumbles upon a secret scroll or gets mentored by someone who knows those abilities.
Kakashi would be very concerned as well. He would approach Naruto in a more calm and collected way compared to Sasuke and Sakura. He would try to understand Naruto's reasons for becoming a fan. Kakashi would then use his own experiences and wisdom to show Naruto the darker side of Doflamingo that he might be overlooking, hoping to bring Naruto back to his normal self.
Well, without more context about this specific fanfiction, it's hard to say exactly what Naruto's role as captain of the 327th entails. He could be leading a team of ninja on various missions, using his rasengan and other jutsu to protect his comrades and complete the tasks at hand. Maybe he has to deal with internal conflicts within the 327th as well.
A plot twist could also be that Fem Naruto's chakra has an unexpected effect on Doflamingo's powers. Since Naruto's chakra is often depicted as something very special and powerful in the Naruto universe, when combined with Doflamingo's Devil Fruit abilities in the One Piece world, it could create a whole new set of abilities or problems. For instance, her chakra might nullify his power temporarily, leading to a situation where he has to rely on her for protection in a dangerous encounter.
For Doflamingo, you can focus on his flamboyant and unpredictable nature. Show his sadistic side in how he deals with enemies, but also explore his more vulnerable moments, like when his plans are thwarted. For Crocodile, emphasize his cool and calculating demeanor. Let his past failures fuel his actions in the fanfiction, like his determination to regain his lost status. Maybe show how Doflamingo's chaos sometimes clashes with Crocodile's order.