One unique aspect is that it often explores Mifune's backstory. Since he has a somewhat mysterious past in the original Naruto series, fanfiction can fill in those gaps.
The combination of Naruto's ninja world and Mifune's samurai elements makes it unique. Naruto's world is filled with chakra and jutsu, while Mifune represents the traditional samurai values like honor and discipline. When these two worlds collide in a fanfic, it creates a new and exciting dynamic. For instance, in some fanfics, Mifune's swordsmanship is pitted against Naruto's ninjutsu, creating intense battle scenes.
Well, in a possible plot, Naruto, as Mifune's grandson, could be trained in the samurai arts secretly. As he grows stronger in these arts, he decides to use them to bridge the gap between the ninja and samurai communities. He might face challenges like convincing the Hidden Leaf Village that the samurai way has value and that they can work together. There could also be a villain who wants to use Naruto's unique position to start a war between the two groups. Naruto would then have to use his ninja skills, samurai training, and his natural leadership to prevent this war and bring peace.
In this fanfiction, Naruto might learn unique sword skills from Mifune. Mifune is known for his swordsmanship, so Naruto could gain a new combat style. Maybe he'd combine his existing ninja techniques with the precision and discipline of Mifune's sword fighting.
One possible 'Naruto grandson of Mifune' fanfiction could be 'The Legacy of the Grandson'. It explores how Naruto, being Mifune's grandson in this fictional scenario, discovers his heritage and uses the skills passed down from his grandfather. It has some interesting plot twists where Naruto combines his own ninja techniques with the samurai traditions of Mifune.
A popular one is 'Mifune and the Chakra Artifact'. It's about Mifune stumbling upon a powerful chakra - based artifact and how he deals with the power it holds. It has some great action scenes and also shows Mifune's wisdom in handling such a dangerous discovery.
One interesting Naruto Mifune fanfic could be 'The Adventure of Mifune and Naruto'. In this fanfic, Mifune, with his samurai skills, teams up with Naruto on a mission. It shows how their different fighting styles complement each other. Another one might be 'Mifune's Training of Naruto' where Mifune imparts his unique samurai wisdom to Naruto, helping him grow not just as a ninja but also as a person in terms of discipline and honor.
Maka would also be a great character to interact with Mifune. As a strong - willed and intelligent student at the DWMA, she might be intrigued by Mifune's skills and his different approach to combat. She could try to learn from him, or even teach him some of the DWMA's ways in return.
Yes, there are likely some out there. You can start by checking popular fanfiction websites like Archive of Our Own. Just search for'mifune x blackstar' on the site and you might find some interesting stories written by fans.