Perhaps Naruto meets Ariel, the Little Mermaid. Naruto, being used to a world full of different abilities and creatures, helps Ariel understand the surface world better. He could also protect her from Ursula using his Rasengan if she tries to cause trouble again.
One idea could be a crossover where Naruto characters end up in the Disney universe. For example, Naruto and his friends could be transported to the world of 'Frozen' and have to help Elsa control her powers in a new way using ninja techniques. Another could be Disney characters visiting the Hidden Leaf Village and being amazed by the ninja culture. Maybe Mickey Mouse could learn some basic ninjutsu.
One common theme is the clash of cultures. Naruto's ninja world culture and Disney's fairy - tale culture collide. Another theme is love and friendship. As Naruto forms his harem, there are elements of love and strong friendships developing among the characters.
One interesting story could be a crossover where Naruto characters end up in the Disney universe. For example, Naruto might find himself in the world of 'Frozen' and his ninja skills could be used to help Elsa control her powers in a new way. Maybe he teaches her some of his chakra control techniques to better manage her ice magic.
The power systems are also quite different. Naruto has chakra and jutsu, which are complex and unique to its universe. Disney movies usually don't have such elaborate power concepts. So, when creating a crossover, it's hard to make the power interactions believable. For example, how would a Disney character react to Naruto's Rasengan? It's not easy to blend these two disparate elements in a seamless way.
In fanfiction, you can also combine their storylines. Say, the plot of 'The Lion King' could be merged with Naruto's journey to become Hokage. Simba's struggle to take his rightful place as king can be paralleled with Naruto's efforts to gain the respect of the Hidden Leaf Village and become its leader. There could be a common enemy that both Naruto and Simba have to face together, something that threatens both the pride lands and the ninja village.
Some ideas for Naruto Disney fanfiction could be that the Hidden Villages are like different kingdoms in a Disney world. Konoha could be a bright and happy kingdom, while Sound Village is more of a spooky, villain - filled place. Naruto could be on a journey to unite all the kingdoms, like a Disney hero. Also, imagine the jutsu in Naruto as Disney - style spells. The Shadow Clone Jutsu could be a spell that creates multiple versions of Naruto, like in a Disney movie where a character has a special power to duplicate themselves. And there could be a story where Naruto and his friends attend a grand Disney - style ball in the Hidden Leaf Village.
There could be some out there, but it's not something that is likely to be mainstream. Naruto is from a very different fictional universe than Disney, and 'lemon' fanfiction usually contains elements that might not be suitable for all audiences. You might have to search in some very specific and perhaps less regulated fanfiction corners of the internet, but be aware of the potential for encountering inappropriate material.
Yes, there are likely some out there. You can try searching on fanfiction websites. Some writers might be creative enough to combine the worlds of Disney princesses and Naruto in unique ways, perhaps having the princesses end up in the Naruto universe or vice versa.
Love is also a huge theme. The oc and the princess usually fall in love, which is different from the original Disney stories where the princesses mostly fall in love with princes. This gives a fresh perspective on relationships in the Disney universe. And it often shows how love can develop between two very different characters, like an ordinary oc and a princess. It can be a slow - burn kind of love or a love - at - first - sight situation.