You can try some popular fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms usually have a wide variety of fanfictions, including those related to Naruto and Soul Eater with a harem theme.
One that comes to mind is 'Naruto in the World of Soul Eater'. It has an interesting plot where Naruto is somehow transported to the Soul Eater world and gets involved in a harem situation. The author does a great job of blending the two universes together.
One common theme is the struggle of the OC to fit in. In a world filled with unique and powerful characters like in Soul Eater, the OC often has to prove themselves worthy. And of course, the harem aspect usually involves different types of relationships - from friendship to romantic interests.
One common theme is the clash of cultures. Since Naruto and Soul Eater have different settings and power systems, when combined in a harem fanfiction, there's often a focus on how the characters from each universe react to the other's way of life. For example, Naruto's ninja code might be at odds with the Meister - Weapon system in Soul Eater.
In Soul Eater harem fanfiction, a frequent theme is the adaptation of the original Soul Eater story elements into the harem setup. For instance, the way the concept of souls and the mission to collect them can be intertwined with the relationships in the harem. It could be that a character's soul - related abilities are linked to their relationship with the main character. Another theme is the cultural differences among the harem members, if they are from different backgrounds in the Soul Eater world, and how these differences create both conflicts and opportunities for deeper connection.
One great Crona x Soul fanfiction is 'The Bond Beyond'. It delves into how Crona and Soul's relationship develops in a more in - depth way than in the original series. It shows them learning about each other's pasts and how they grow together. Another one could be 'A Different Kind of Friendship'. This fanfiction focuses on how they start as friends but there are hints of deeper feelings emerging as they face various challenges in the world of Soul Eater.
There are many places to find such fanfiction. Firstly, Fanfiction.net has a large collection. Browse through the Naruto and Soul Eater sections and look for stories that specifically mention Patty. Another option is Archive of Our Own. It has a great tagging system which can help you narrow down the search to exactly what you're looking for. Some fanfiction might be about how Patty from Soul Eater could interact with the characters in Naruto, or it could be a more complex crossover story with an interesting plot.
Friendship and loyalty are also prevalent. In many fanfictions, female souls form strong bonds with other characters. They rely on each other in battles and in their personal growth. This is important as the Soul Eater world can be very dangerous and having friends to count on is crucial.
One popular Soul Eater OC Harem Fanfiction is 'Soul's New World'. It has an interesting plot where the OC character enters the Soul Eater universe and forms unique relationships within a harem. The story is well - written with great character development.
Another one to check out is 'Naruto and the Soul Eater Harem'. This fanfiction delves deep into the interactions between Naruto and the female characters from Soul Eater. It has some really cool fight scenes and character development, all while exploring the harem concept in a creative way.