Vali is also a likely winner in many scenarios. His Divine Dividing ability gives him an edge in combat, being able to halve his opponent's power and double his own. In a death battle, this could be a game - changer.
In a Naruto vs Riser fight in a Highschool DxD fanfiction, Naruto would likely win. Naruto has a vast array of powerful jutsu like the Rasengan and Shadow Clone Technique. He's also incredibly resilient and has great combat experience. Riser, while strong in the Highschool DxD universe, doesn't have the same level of combat versatility as Naruto.
The Highschool DxD manga is finished. It completed its journey, leaving behind a memorable story. Although it's over, its influence and popularity among manga lovers remain strong.
The Highschool DxD manga has indeed finished. It wrapped up after completing all the planned story arcs and providing a satisfying conclusion for the readers.
If Spawn were to interact with the main characters, he would bring a whole new level of seriousness. He has a dark past and a lot of baggage. When it comes to Issei's goal of becoming a harem king, Spawn might find it absurd but also interesting in a way. He could offer his own perspective on power and how to use it responsibly, which would be a contrast to the more carefree attitude of some of the Highschool DxD characters. And with the other characters like Akeno and Koneko, he'd be sizing them up, trying to figure out if they're threats or allies.
The storylines can be combined by creating a common threat. Suppose an enemy emerges that is interested in both the power of the Bijuu and the power sources in Highschool DxD. This would force the characters from both universes to team up. Also, the cultural differences between the Naruto world and the Highschool DxD world can be explored. Naruto could introduce concepts like ninja clans and shinobi training to the DxD characters, while they could introduce him to the complex social hierarchies and supernatural politics in their world.