Delsin might develop a stronger sense of responsibility in RWBY fanfiction. In the RWBY world, there are greater stakes, like the safety of entire kingdoms. So, he could go from just using his powers for personal reasons or to fight local threats in his world to being more committed to protecting Remnant as a whole. This could be shown through his actions, like volunteering for dangerous missions to keep the people of Remnant safe.
He could also become more team - oriented. Since RWBY emphasizes teamwork, Delsin might start to rely more on his teammates and learn to coordinate his powers better with them. For example, he could use his powers to create distractions while his teammates launch a surprise attack. This would be a big change from his sometimes solo - act approach in his own story.
One possible storyline could be Delsin teaming up with Team RWBY to fight a new, powerful Grimm. He might use his unique powers, like his smoke or neon abilities, to complement the girls' skills. For example, his mobility could help in quickly getting to different parts of the battlefield.
Delsin's powers are somewhat fluid and adaptable. In a Sekirei fanfiction, his powers could adapt to the energy or essence of the Sekirei he is interacting with. Maybe his powers would take on new forms or properties based on the Sekirei's power, leading to unexpected and exciting new abilities when they combine their powers.
One great Naruto Delsin Rowe fanfic could be 'The Unlikely Alliance'. It's a story where Naruto and Delsin Rowe from different fictional universes somehow cross paths. In this fanfic, the author does an amazing job of building a connection between their powers. Naruto's ninjutsu and Delsin's ability to absorb and use powers create some really cool battle scenes and interactions.
Ruby might become more isolated. Her new powers set her apart from others. Her friends may not be able to fully understand what she is going through, and she may start to feel alone in her new state of being. For instance, she may have powers that are beyond their comprehension, and simple conversations about daily battles or hunts become difficult as she now has a different perspective on power and danger.
Archer Emiya may become more adaptable in RWBY crossover fanfiction. Since the RWBY world has its own set of rules and challenges, he has to adjust. For example, he might start using RWBY - style tactics more often. He could also become more open - minded as he interacts with the diverse characters in RWBY, which is different from his more solitary nature in his original story.
She could develop a more cynical view of the world. In the face of abuse, her naivete might be replaced with a sense of wariness. For example, she may be less likely to trust new people or situations easily. Ruby might also become more determined in a different way. Instead of being determined to be a great huntress in the normal sense, she could be determined to overcome the abuse and prove that she can't be broken.
Cinder might become more adaptable. In the RWBY world, she is used to a certain set of rules and powers. But in the Halo universe, she has to quickly learn new things. So she could become more open - minded about different ways of fighting and surviving.
A plot could revolve around Delsin's discovery of the Sekirei world. He might initially be confused but then form an alliance with a particular Sekirei. Their relationship could grow as they face common enemies within the Sekirei universe, like other Ashikabi who have more malicious intents in the Sekirei Plan.
In many RWBY Reincarnation fanfictions, Ruby often becomes more introspective. Her reincarnation forces her to look at herself in a new light. For example, she might question her past actions and decisions. She may also become more cautious as she adapts to the new world she's in.
You can start by looking on fanfiction.net. It has a large collection of fanfics from various fandoms, including ones that combine Naruto and Delsin Rowe. Just use the search bar and type in relevant keywords like 'Naruto Delsin Rowe'. Another option is Archive of Our Own (AO3). It also has a wide range of fan-created content, and the tagging system makes it easier to find specific types of fanfics.