There probably is. Fanfiction writers often come up with really creative crossovers. However, the quality can vary a great deal. Some might be really well - written with interesting plotlines that blend the Naruto and Soul Eater universes in a unique way, while others might not be as good. It's all about exploring different interpretations of the characters and their worlds.
Black Star would probably see Asura as a new opponent to prove his strength against. He would be eager to fight, shouting his usual boasts about being the one to defeat the most powerful foe. However, he might quickly realize that Asura is on a whole different level and would need to rely on his friends more than he thought.
I'm afraid I can't recommend a particular 'Naruto is Asura Soul Eater' fanfiction. However, when you search on those fanfiction platforms, look for ones with high ratings and positive comments. Also, pay attention to the writing style. If the summary grabs your attention and the writing seems polished, it's more likely to be a good read.
Perhaps in this crossover, Asura's power is somehow transferred to one of the weapons in the Soul Eater world. This weapon then becomes an uncontrollable force, and the meister has to find a way to either contain or purge the Asura - like power within it. It could also cause a rift between the meister and their friends as they struggle to deal with this new, dangerous situation.
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.
I think it is. The plot has depth, the action scenes are exciting, and it has a good mix of humor and drama. However, it might not be for everyone depending on personal preferences.