Well, if Naruto becomes a Riser in a fanfiction, the plot could change drastically. Maybe Naruto would inherit Riser's powers which are related to fire and some sort of devilish abilities. He might start to have a different view of the ninja world. Instead of the traditional ninja values he grew up with, he could be more influenced by the power - hungry nature that might come with Riser's powers.
His character would become more complex. Naruto is known for his positive and determined attitude. But as Riser, he might have a more egotistical side. He could start to show off his new powers more and be less concerned about the feelings of others at times.
In the beginning, Naruto and Riser may not get along well due to their different personalities and upbringings. Naruto is more down - to - earth and values friendship and justice, while Riser is more prideful. But when they discover they are brothers, they are forced to interact. As they spend time together, they realize they have more in common than they thought. For example, they both have a strong sense of protectiveness towards their loved ones. This realization could lead to them gradually building a strong relationship. Naruto might even start to understand Riser's pride as a form of self - confidence, and Riser could come to admire Naruto's selfless nature.
Well, one possible plot could be that Naruto is somehow transported to the world where Riser exists. Naruto, with his strong will and powerful jutsu, might see Riser's actions as unjust and decide to oppose him. Maybe Riser is causing trouble in a village or harming innocent people, and Naruto steps in to protect them.
However, if the battle occurs in Riser's domain where he can manipulate his magic more freely, Riser could have the upper hand. Riser has his own set of powerful spells and abilities. But Naruto is known for his adaptability. He has faced many powerful foes in his own world and found ways to overcome them. So, it's hard to say for sure who would win. It could also come down to things like strategy and who has the stronger will to win.
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.
One possible reason could be a power struggle. If Riser somehow poses a threat to Naruto's world or his friends. Naruto, being the protector, might take extreme measures. For example, if Riser was trying to take over Konoha or steal some important ninja art. Naruto would fight to defend his village and in the heat of battle, end up killing Riser.
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.
The plot would take on a more action - oriented and heroic tone. Naruto is a hero at heart, always looking to protect the weak and fight for what's right. In contrast to Riser, he would actively seek out problems to solve and villains to defeat. His presence would also attract different kinds of antagonists, those who oppose his ideals of peace and justice, which would create a whole new set of storylines.
Well, it could be about Naruto being in a strange new world where he is somehow related to Riser. Maybe they team up to fight common enemies, with Naruto bringing his ninja skills and Riser his own unique abilities.