Perhaps it's related to his connection with the Nine - Tailed Fox. In the original Naruto story, he has a strong bond with the Nine - Tailed Fox. In the fanfic, this bond could have evolved in a way that allows him to summon foxes. It could be a manifestation of the latent power within him that he finally manages to tap into and use to summon these fox - like creatures.
The ability to summon foxes might make Naruto more of a target. Villains would be interested in his new power. This could lead to more dangerous and complex storylines as Naruto has to not only protect himself but also the foxes he summons. It could also lead to new alliances as other characters see the potential of the foxes in the fight against common enemies.
One possible origin could be some kind of ancient bloodline. Maybe Naruto has a hidden bloodline that was passed down through generations and finally awakened, allowing him to summon angels. Another option is that he got this ability through a special training or a quest. He might have found a hidden place or an old sage who taught him the art of summoning angels.
In some fanfictions, it could be due to a genetic mutation or an unexpected side - effect of a jutsu he uses. For example, if he experiments with a new form of chakra manipulation, it might accidentally give him the power to summon swords. Or maybe it's a gift from the Sage of Six Paths in a different interpretation of the Naruto universe.
The summoned foxes could make some characters more wary of Naruto. For example, if the foxes are seen as powerful and unpredictable, some ninjas might be afraid of Naruto's newfound ability. On the other hand, it could strengthen his bond with characters like Kakashi. Kakashi, being a wise and experienced ninja, might see the potential in Naruto's fox summons and offer to train him further in using them effectively.
One idea could be that Naruto summons a special fox with unique powers that helps him defeat a powerful enemy in a new and unexpected way. For example, the fox might have the ability to create illusions so strong that they can mislead even the most powerful ninjas. Another plot could involve Naruto using the summoned foxes to explore a hidden part of the ninja world that was previously inaccessible. Maybe the foxes know the secrets of an ancient ruin and lead Naruto there, where he discovers new jutsus or artifacts.
One possible plotline could be that the two female foxes are somehow related to the Nine - Tailed Fox's past or origin. Maybe they were part of a forgotten era in the history of the tailed - beasts.
One possible reason could be that he is influenced by Orochimaru's techniques. Maybe he discovers some of Orochimaru's old research and figures out how to use snake summoning for his own good. Another reason might be that he is trying to find a new power source to defeat a very powerful enemy that normal jutsu can't handle.
Well, it could make some characters more curious about him. For example, his friends like Sakura and Sasuke might be a bit intrigued. Sakura could see it as another unique aspect of Naruto and might be more protective of this secret. Sasuke, on the other hand, might be a bit suspicious at first, thinking it could be some new power Naruto is hiding. And the village elders might view it as either a threat or an opportunity, depending on how they perceive Naruto at that time.
I'm not sure specifically as I haven't read this exact fanfic. But generally, in Naruto fanfics, it could be about Naruto's adventures with some element of fox - related luck. Maybe it has to do with his connection to the Nine - Tailed Fox and how that brings him unexpected good fortune in battles or in his relationships within the ninja world.
In some fanfictions, Naruto might gain the ability to summon zombies through dark magic or a forbidden jutsu he discovers. Maybe he stumbles upon an ancient scroll that teaches him this unorthodox summoning technique.