It could be a foreigner who travels to the Naruto world. This person already has some knowledge of pony magic from their own land. When they arrive in the Naruto world, they find that their pony - summoning abilities work in a different way. They become a sort of mediator between the two different forms of magic and creatures, using their unique skills to help the ninjas and also learn from them. They are a curious and adaptable character who is constantly exploring the boundaries of their powers.
The main character could be a young orphan who discovers they have the power of a summoner. They grow up in the Naruto world but have always felt out of place. One day, they accidentally summon a pony and realize they have a connection to another world. This character would be on a journey to discover their true identity and the full extent of their summoning powers.
It could be Naruto himself. Imagine Naruto with the power to summon kaiju. He would be even more of a force to be reckoned with. His usual knack for making friends could extend to the kaiju he summons, and he could use their power in his never - ending quest to protect the Hidden Leaf Village and bring peace to the ninja world.
It could be a new genin who has always felt different from the other ninja in their class. This character discovers their kitsune summoning ability during a training exercise and then embarks on a journey to master it.
Another option could be a character who was once a villain or a criminal but is given a second chance through the power of chimera summoning. They use this new ability to redeem themselves and fight for a different cause, which would make for a very interesting character arc.
It could be a young genin who has always been interested in spiders and discovers their arachnid summoning ability. Maybe they were orphaned and had to rely on their own wits and new - found power to survive in the ninja world.
One possible interesting plot could be a summoner who can call upon both Naruto - style ninja beasts and ponies from Equestria. Maybe they have to use their combined powers to stop an evil force that is threatening both the ninja world and the pony world. For example, the villain could be stealing chakra from the ninjas and magic from the ponies to become all - powerful.
Arya Stark could be an interesting main character as a summoner. She already has a lot of skills like stealth and combat. If she were a summoner, she could summon the spirits of those she has killed to either help her in battles or to gather intelligence. It would be a new twist on her character.
It could be another summoner who is jealous of the panther summoner's power. This antagonist summons a powerful and dangerous beast, like a giant snake, to constantly challenge the panther summoner and try to steal their power or reputation.
The main antagonist could be one of the village elders. They might see Naruto's fox - summoning abilities as too dangerous and banish him out of fear. Throughout the fanfiction, they could try to prevent Naruto from coming back to the village, fearing that he'll seek revenge or disrupt the power balance they've established.
Maybe the character initially struggles with the fact that summoning a hydra is seen as an evil or dark art in the Naruto world. As they progress, they try to change the perception of others about hydra summoning by using it for good, like protecting the village from greater threats. This way, they develop not only in their skills but also in their standing within the community.
Obviously, Naruto would be one of the main characters. Since it's a fanfiction about him as a dragon summoner. There might also be his friends like Sasuke and Sakura. Sasuke could be intrigued by Naruto's new power and might have a complex relationship with it, either being competitive or even learning from Naruto in some way. Sakura could be worried about the risks Naruto takes with this new and dangerous power.