Well, one unique aspect is the blend of two very different fighting styles. Naruto has his ninja - based combat with jutsus and Baki has his intense grappling and martial arts. When combined in fanfiction, it creates some really exciting fight scenarios.
Another one is 'The Grappler Naruto'. This one imagines Naruto having a grappling - based fighting style similar to Baki. It delves into how Naruto would train in this new form of combat and how it would change his battles. It's quite creative in its take on combining the two universes.