Medusa could also be involved. She is always scheming and looking for ways to further her own goals. Mifune's presence could disrupt her plans, and she might try to manipulate or get rid of him. This would create a lot of tension and action in the fanfiction.
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.
Maybe Mifune's code of honor clashes with the more chaotic and rule - bending nature of some of the Soul Eater characters. For example, he might not approve of how Black Star is so eager for glory and fame without following proper protocol. This could lead to interesting character development and story arcs for both sides.
I'm not sure if there are a lot of such fanfics out there. But it could be an interesting concept. Maybe in this fanfic, Mifune, with his samurai skills and honor, imparts unique combat and life lessons to Black Star. It might show how Black Star grows under Mifune's guidance, both in terms of his fighting abilities and his understanding of the world around him.
Natsu from Fairy Tail and Maka from Soul Eater. Natsu is a hot - headed and powerful mage, always eager for a fight. Maka, on the other hand, is a determined Meister with a strong sense of justice. Their common goal of defeating powerful enemies would likely bring them together. Natsu's brute strength and Maka's strategic thinking could make for a great combination in battles.
One interesting concept could be the combination of different universes. For example, melding the world of Mifune with a fantasy realm. This can bring about unique character interactions where the traits of Mifune characters are contrasted with the magical beings of the other world.
Growth. Black Star could grow from a brash and overconfident young man to a more refined and powerful fighter under Mifune's tutelage.
Maka Albarn would be a likely ally. Maka is a strong - willed and intelligent meister in Soul Eater. Just like Sakura, she is dedicated to her goals. They could bond over their shared determination. Maka could teach Sakura about the ways of the DWMA, and Sakura could share her ninja knowledge with Maka. They could fight side by side against any threats that come their way in this crossover world.
The interactions would be diverse. Ruby's bubbly personality could break the ice with some of the more serious Soul Eater characters like Stein. Weiss's refined upbringing might clash with the more rough - around - the - edges nature of some of the Soul Eater students. Blake could find common ground with Soul, as they both have a bit of a dark side. Yang would be a source of energy and enthusiasm in the crossover. The Soul Eater characters would introduce the RWBY crew to the concept of collecting souls and how important it is in their world, while the RWBY characters would share their experiences of fighting for their world against the Grimm.
The characters' interactions would be a blend of different cultures and power sets. Naruto's team might be amazed by the Death Scythes in Soul Eater. They could see them as super - powerful weapons compared to their kunai and shuriken. Meanwhile, the Soul Eater characters would be intrigued by Naruto's ability to summon toads. They might ask him to summon one for them to study. And when it comes to the Juubi, characters like Kid from Soul Eater, with his love for symmetry, might be especially interested in studying the Juubi's power structure, while Naruto would be more focused on how to defeat it.
Naruto would probably be very enthusiastic and friendly towards the Soul Eater characters. He might be a bit confused at first about the whole concept of meisters and weapons, but his curious nature would make him eager to learn. He could bond with Soul over their shared love for food perhaps. And with Maka, he might share his experiences about growing up without parents and how he overcame that.
I think Quinn and Black Widow would be an interesting pair. Quinn is used to being in a position of power and popularity in the Glee club, and Black Widow is a strong female character in the Avengers. They could have some really cool exchanges about strength and femininity.