If Naruto were to fight Riser Phenex in a fanfiction, the battle would likely be a clash of different power systems. Naruto's ninja techniques are based on chakra control and his own physical training. Riser's powers come from his devil heritage. The fight could potentially attract the attention of other characters from both the Naruto and High School DxD universes. And depending on the writer, Naruto could either win through sheer force or by using his wits to outsmart Riser.
Well, in a fanfiction where Naruto fights Riser Phenex, Naruto's combat skills and chakra powers would be pitted against Riser's devil abilities. Naruto might start with his signature jutsu like the Rasengan. Riser, on the other hand, could use his fire - based devil powers. It could be an intense battle with Naruto trying to outmaneuver Riser's attacks and find a weakness in his defenses.
Maybe in the fanfiction, Naruto is reincarnated as Riser Phenex in the Naruto world. He has to deal with the memories and instincts of Riser while also trying to maintain his identity as Naruto. He could use Riser's abilities, like his fire - based powers and his unique magic, to fight against new threats in the Naruto universe and also to protect his friends and village.
I'm not sure specifically about a 'naruto is riser phenex' fanfiction. You could try searching on fanfiction - related websites like FanFiction.net or Archive of Our Own. They have a vast collection of fanfictions, and you might be able to find one that fits this concept by using their search functions.
Love and relationships are also common. Writers often create stories around Riser's romantic interests or his friendships. For example, some fanfictions focus on his relationship with his arranged marriage partner and how they grow to understand each other.
Well, if Naruto replaces Riser, there would be a huge shift in the story's dynamics. Naruto's strong sense of justice and his never - give - up attitude would likely change the way conflicts are resolved. He might use his ninja skills to handle challenges in a more direct and action - packed way compared to Riser.
Naruto could win by using his Sage Mode. In Sage Mode, his strength, speed, and perception are enhanced. He could easily dodge Riser's attacks and counter with powerful Sage - enhanced jutsu. His ability to sense chakra would also help him predict Riser's moves.
In a Naruto - reborn - as - Riser - Phenex fanfic, Naruto could introduce new fighting styles to the DxD universe. His taijutsu skills combined with Riser's magic could create a whole new combat system. Additionally, his experience with the Nine - Tails could translate into something unique in this new world. Maybe he could have a sort of internal 'demon' like power within Riser's body that he has to learn to control, just like he did with Kurama.
One interesting plot could be Riser Phenex facing a challenge that is related to a lemon - perhaps a magical lemon tree that has special powers. In the fanfiction, he might have to protect this tree from other devils who want to use its power for evil. This could lead to a series of battles and alliances as he tries to safeguard the lemon tree and its secrets.
Well, Naruto might use his unique jutsu like Rasengan in new and creative ways against the combined forces of the 5 nations. Maybe he would form new alliances within the 5 nations to fight against a common hidden enemy that threatens them all.
His complex personality. Riser is initially portrayed as a bit of a villain, but he has his own motives and insecurities. Fanfiction writers like to explore these aspects, like his pride which is both his strength and his weakness.
There might be a fanfiction where Riser Phenex discovers a new power within himself. This could lead to a whole new set of adventures as he tries to master it and also deal with the political implications within the Highschool DxD universe, like how other devil families react to his newfound strength.