Jon Snow is the central figure. Besides him, characters like Tyrion Lannister could be important. Tyrion is known for his intelligence and might be able to help Jon understand his new identity and powers. Also, Arya Stark could be a main character. She might have an interesting dynamic with Jon in his new form, perhaps she initially doesn't recognize him but then they form a new bond.
Obviously, Jon Snow as a reborn dragon is the main character. But there could also be characters like Daenerys who might play an important role. She has her own connection with dragons, so her reaction to Jon's new form could be a significant part of the story.
Well, the dragon would obviously be a main character in its own right. It could have its own personality and motives.
Obviously, Jon Snow is a main character. He's usually depicted as having a special bond with the ice dragon. His character traits like his honor and leadership often play a big role in the story.
Arya Stark might interact with him. She has her own set of skills and goals. Their reunion could be emotional, and they could work together to take revenge on those who wronged their family.
Daenerys Targaryen is often paired with Jon Snow in these fanfictions. Their connection in the original series, along with their both being strong leaders, makes for an interesting dynamic. They could rule Westeros together in a new era of peace and prosperity after Jon's rebirth.
In the 'Jon Snow Reborn as Dragon fanfic', an exciting plot might be his journey to discover the true nature of his rebirth. Is it a gift from a long - forgotten god? Or is it a result of some ancient magic that was accidentally unleashed? Along the way, he could meet characters who have knowledge about dragons and his situation, leading to a series of revelations that change his understanding of himself and the world.
Sansa Stark might be involved as well. Given her relationship with Jon Snow as his sister (though later revealed otherwise), she could play a role in protecting or being involved with the baby. Maybe she helps raise the baby in a world where Jon Snow is constantly facing threats.
Probably Goku would still be one of the main characters. He's the face of Dragon Ball after all. Vegeta is also likely to be a main character as he's always been an important part of the story. Maybe there are new characters created specifically for the fanfic that also become main characters, but without reading it, it's hard to say for sure.
Daenerys Targaryen could be one to help. Since she has experience with dragons, she could give Jon Snow advice on how to care for the egg and hatch it.
Brienne of Tarth is a character that can be paired with Jon Snow in fanfictions. Brienne is known for her loyalty and honor. She could serve as Jon's knight, protecting him and upholding justice in his kingdom. Also, Gilly could be part of the story. As Samwell Tarly's love interest and a person with knowledge from the far North, she could provide insights into the common people's needs and also help in matters related to the Night's Watch or the North in general.
One popular 'Jon Snow Black Dragon' fanfic is 'The Bond of Ice and Dragon'. It tells a story where Jon Snow forms an unexpected connection with a black dragon. The story is filled with adventure and a touch of magic.