The Persona characters might get a more ninja - like aesthetic. For example, their school uniforms could be modified with elements like ninja tabi shoes or kunai holders. Their hair might also be styled in a more practical way for combat, similar to the Senran Kagura characters. On the other hand, the Senran Kagura characters could get some elements from the Persona world. Maybe they would have some modern - day accessories like cell phones with Persona - themed cases. Their ninja outfits could also incorporate some of the color schemes or symbols associated with the Persona characters.
Perhaps a plot where the Persona characters are invited to a special tournament in the Senran Kagura world. The tournament has strange rules that are different from what they are used to. As they participate, they start to notice some dark undercurrents. It turns out that an enemy is using the tournament to drain the energy of the combatants for a nefarious plan. The Senran Kagura and Persona characters must then put aside their differences and work together. The Persona characters can use their Personas to analyze the situation and the Senran Kagura characters can use their combat expertise to fight the physical battles.
A cool Senran Kagura Crossover Fanfic idea would be to cross it with a post - apocalyptic setting. The Senran Kagura characters have to survive in a world full of ruins and new threats. They could meet survivors from other universes or games. It would be interesting to see how their skills adapt to this new environment. Also, a crossover with a steampunk world. The girls would get to use steampunk - style weapons and gadgets while still maintaining their own fighting styles.
First, decide on the crossover concept. As I mentioned before, it could be with a different game, anime, or genre. Then, research both the Senran Kagura world and the world you want to cross it with. Know the characters, their personalities, and their abilities. After that, create an outline. Plan the beginning, middle, and end of your story. Maybe start with how the two worlds collide or how the characters meet.
A possible fanfiction could be about a character from Naruto ending up in the world of Senran Kagura. Let's say Naruto himself gets transported there. He would be really confused at first by the different rules and the all - female cast (mostly). But then he starts to adapt and uses his shadow clone jutsu in creative ways during battles against the various enemies in the Senran Kagura world. He could also make friends with some of the characters and teach them about chakra.
Another theme is often the development of relationships. The male oc might form friendships, rivalries or even romantic relationships with the female characters. For example, in some fanfictions, he may start as an outsider but gradually build deep friendships with the girls through shared battles and experiences.
In 'senran kagura male oc fanfiction', a frequent theme is power and growth. The male OC may start off as a relatively weak or inexperienced character and then gradually become stronger through training and facing challenges. Also, romance can be a common theme. Since the Senran Kagura world has many interesting female characters, it's not uncommon for a male OC to get involved in a romantic relationship with one of them, which can add a whole new layer of drama to the story.
I haven't read this particular 'blow to katsuragi senran kagura fanfic' specifically. But generally, in fanfics related to Senran Kagura, they often explore the characters in more depth. Maybe this one focuses on Katsuragi and some kind of 'blow' could refer to an action, event or even a metaphorical concept within the story.