It's hard to say exactly what's new without reading it. But it might feature never-before-seen battle scenes or deeper exploration of the characters' backstories.
Could be new powers for the warriors, or a different take on the existing relationships. Maybe a hidden world or mystery is introduced that wasn't in the original.
It could be about the Ronin Warriors facing a new and terrifying enemy that has powers they've never encountered before. Maybe a dark force from another dimension.
A new terror Ronin Warriors fanfic can stand out if it has unique plot twists or unexpected character developments.
It could be Ryo. Since he is often seen as a leader among the Ronin Warriors, he might be the main focus when facing this new terror.
The Ronin Warriors cartoon shows have exciting action scenes and interesting character designs. The storylines are usually full of adventure and fantasy elements.
Often, in these fanfictions, there are new character relationships. For example, Naruto characters might form unexpected alliances or rivalries with the Ronin Warriors. This can lead to some very interesting plot twists and character development. Also, the fanfictions can explore different moral and ethical concepts as the two different cultures collide. The Ronin's honor - based system might contrast or complement the ninja's way of life in Naruto. Another aspect is the new combat styles that emerge when the powers of Naruto characters and Ronin Warriors are combined. This can make for some really epic battle scenes.
I also like 'Naruto and the Ronin's Code'. This fanfiction delves deep into how Naruto might be influenced by the code of the ronin. It shows his growth as he tries to understand and incorporate some of those values while still staying true to his ninja way. It has a great character development arc for Naruto.
The Ronin Warriors manga is often more detailed in its world-building. In the adaptations, some subplots might be condensed or left out to keep the pacing. But both still capture the essence of the story.
One idea could be to cross them over with a modern superhero team. The Ronin Warriors could learn new fighting techniques from the superheroes and vice versa. It would be cool to see how their different powers and armors interact.
For a crossover with 'Sailor Moon', Sailor Moon and her friends could be included. The contrast between the magical girl powers of Sailor Moon and the more martial - arts - based powers of the Ronin Warriors would make for an exciting story. There could be a battle against a common enemy that requires both groups to combine their powers.
Sadly, just from the name 'ronin2106 fanfic', it's impossible to tell who the creator is. It could be an amateur writer or someone within a specific fan community, but without more context, we're in the dark.