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.
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.
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.
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.
He could also be portrayed as a bit of a trickster when it comes to lemons. Maybe he uses lemon - scented illusions to deceive his opponents. In this way, the lemon becomes a tool for his devious plans. He might also be shown as someone who is protective of lemon - related things that he values, like a lemon grove that has some sort of magical significance.
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.
Naruto's never - give - up attitude would be a huge influence. Riser, in the original story, sometimes took the easy way out. But with Naruto's personality, he would be more likely to face challenges head - on. For instance, in battles or in dealing with political situations within the DxD world. Also, Naruto's loyalty to his friends would make Riser more trustworthy in the eyes of others.
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.
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.