In this fanfiction scenario, Naruto being the son of Sparda could introduce a whole new world of magic and demons to the Naruto universe. He may have to face demons that are attracted to his new demonic heritage. Naruto would then need to learn about his father's past and the secrets of the Sparda bloodline in order to control his powers and protect both the ninja world and the world of demons that his father was related to.
If Naruto becomes the son of Sparda, he could gain access to Sparda's weapons. Imagine Naruto wielding a sword similar to those in the Devil May Cry series. This would completely change his fighting style. He could combine his existing ninja techniques with the swordplay skills. His opponents would be very surprised to see Naruto with a new set of abilities and a different approach to battles.
Well, one possibility could be that Naruto inherits Sparda's incredible demonic powers. He might use these new powers to protect Konoha in ways he couldn't before. For example, his combat skills could be enhanced to a whole new level, allowing him to defeat enemies with ease. Also, his relationship with his friends might change as they try to understand this new side of him.
The plot could also involve Naruto being transported to the world of Sparda. There, he has to learn the ways of that world to survive. He might meet characters similar to those in his own world, but with different abilities. And he could form new alliances, like teaming up with demons who oppose the main evil forces in the Sparda universe.
Well, in a 'naruto is the son of sparda fanfic', the plot could start with Naruto's birth. Maybe his mother was from the Naruto world and his father was Sparda. Naruto grows up an outcast in his village because of his strange powers. He is then guided by a mysterious figure who reveals his true parentage. From there, he travels to different dimensions to learn about his father's legacy and gain the power to protect his world from a looming threat that is attracted to his unique heritage. As he does this, he also tries to gain acceptance in his own village.
A plot might be that Naruto is born in the Naruto universe but has dreams and visions of Sparda. As he grows, he starts to show extraordinary powers that are not normal for a ninja. He then embarks on a journey to find out who Sparda is and discovers that he is his father. Along the way, he meets characters from the Devil May Cry universe who help him understand his powers. He has to fight against ninja clans who want to use his powers for their own gain and demons who want to corrupt him. He uses his Naruto - like tenacity and Sparda - inspired powers to overcome all these obstacles.
The fanfiction might explore the concept of a Naruto character being a descendant of Sparda in many ways. For instance, the character could have a special form or transformation similar to Dante's devil trigger in the Devil May Cry series (since Sparda is from that). This form could give them enhanced strength, speed, and abilities. They could also face challenges related to their dual heritage, like being shunned by some in the Naruto world who fear the unknown powers. And the story could revolve around how they overcome these prejudices and prove themselves as a valuable asset to their comrades and the entire ninja community.
Naruto's character would likely become more serious. The burden of his new heritage as Sparda's son would force him to grow up faster. He might not be as carefree as before.
In this fanfiction, perhaps Naruto is sent to Vergil's world for some reason. There, he might be exposed to the same kind of power sources as Vergil, like demonic energy. His own chakra could start to mutate and transform, gradually making him more like Vergil. And with Naruto's strong will and Vergil's combat skills, it would create a really interesting character.
The main antagonists could be the Akatsuki from the Naruto world. They might see Naruto's new powers as a result of being Sparda's son as a great asset and try to capture him to use for their own evil plans, like creating some sort of super - weapon or using his power to take over the ninja world.
Well, it could involve Harry having some of Dante's devil - slaying abilities. Maybe he uses them to fight the dark forces in the wizarding world that Voldemort represents in a more unique way than just magic. For example, he could have enhanced speed and strength like Dante to take on Death Eaters.
Yes, there might be some out there. There are a lot of fanfic writers who come up with really creative crossovers. You can start by looking on popular fanfic websites like Archive of Our Own or FanFiction.net. Some writers might take the idea of Naruto being the son of Sparda and build an amazing story around it, exploring how Naruto's ninja skills could be combined with Sparda's demon - slaying abilities.
Naruto may also become more solitary. Sparda often fought alone, and Naruto, influenced by this, might start to distance himself from his friends at first. However, he would still have that underlying loyalty and would eventually find a way to balance his new - found independence with his relationships.