Well, in such a fanfic, Naruto would likely be considered the strongest. Since it's a 'Naruto strongest' concept in a Fairy Tail setting, Naruto brings his powerful ninja skills like the Rasengan and Shadow Clone Jutsu. His ability to quickly adapt and his large chakra reserve would give him an edge over many Fairy Tail characters.
It could be Sasuke. He already has great combat skills and if he were to focus more on swordsmanship, he could be a very strong swordsman. His Sharingan would give him an edge in predicting his opponents' moves and countering them effectively with his sword.
I'm not a fan of web novels. I'm just a fan of web novels. I can't provide any information about Naruto. If you have any other questions, I will try my best to answer them.
Obviously Naruto would be one of the main characters since it's in the title. But there could also be other characters like his friends and foes from the original Naruto series, such as Sasuke and Kakashi. They might play different roles in this fanfiction with Naruto being the strongest devil.
In many Naruto fanfictions, characters like Madara Uchiha are often considered extremely strong. His Sharingan abilities, especially the Eternal Mangekyo Sharingan, give him incredible power over illusions and combat skills.
In a fanfiction where Naruto is in the Highschool DxD universe, Naruto could potentially be one of the strongest devils. His vast chakra reserves and powerful jutsu like the Rasengan and Shadow Clone Technique could give him an edge. He has extensive combat experience and his ability to learn quickly would also help him adapt to the new world of devils, angels, and fallen angels in Highschool DxD.
It's really hard to say. Goku has the power to destroy planets and reach incredible levels of strength with his Super Saiyan forms. However, Naruto has the power of the tailed beasts and his own sage mode which gives him a huge boost in power. And Sonic, while he may not have the raw power like the other two in terms of destruction, his speed is so great that he could potentially outmaneuver both of them. So it really depends on the situation and how the author writes it.
Typically, Naruto would likely be one of the main characters since it's a Naruto - related fanfiction. And of course, the 'strongest angel' character would be a main character too. There might also be other well - known Naruto characters like Sasuke or Sakura involved depending on the plot.
It's hard to say. If Naruto is truly godlike, he could be very strong. But Goku has his own amazing power - ups. Maybe in the end, it would depend on how the author writes it. If Naruto can combine his ninja skills with his new godlike powers in a really clever way, he could be the strongest. But Goku's Super Saiyan forms are no joke either.
In a lot of these fanfictions, there are Anbu who have been trained in secret arts. These Anbu can be extremely powerful. For example, an Anbu who has mastered a forbidden jutsu that gives them enhanced speed and strength. Also, characters who have a combination of different ninja abilities, like being excellent at both taijutsu and ninjutsu, are usually among the most powerful in 'naruto strongest anbu fanfiction'. They can adapt to various battle situations better than others.