Jon Snow is often associated with the ice dragon in many fanfictions. Given his connection to the North and his role in the fight against the White Walkers in the original series, it makes sense for him to be linked to such a powerful and ice - related entity like the ice dragon.
Bran Stark might be related to the ice dragon in some fanfictions. With his powers as the Three - Eyed Raven, he could potentially have a connection to the ice dragon, either through visions or some form of magical influence. This could add an interesting layer to his character's role in the overall story of the fanfiction.
Daenerys Targaryen might also be a main character in such fanfiction. Since she has her own dragons, the addition of an ice dragon to the story could create an interesting dynamic. Maybe she tries to tame the ice dragon or has to face it in battle.
Naruto is likely to be the central figure in this fanfiction. Alongside him, the ice dragon is a key character. There could also be other characters from the Naruto universe, like his friends such as Sasuke or Sakura. They might interact with Naruto and the ice dragon in different ways. For example, Sasuke could be suspicious of the ice dragon's motives at first, while Sakura might be more interested in studying the dragon's unique physiology if she has the chance.
I'm not sure specifically as it depends on the fanfic. But it could have a brave knight who is not afraid of the ice dragon at first sight. He might be on a quest related to the dragon.
Obviously, the Dragon King himself is a main character. He is usually depicted as a powerful and complex figure, with his own goals and desires for the kingdoms. Daenerys Targaryen is also often present, either as an ally or a rival to the Dragon King, given her own connection to dragons in the original series.
One interesting plotline could be the ice dragon's role in changing the power dynamics in Westeros. It might side with a particular house and help them gain an upper hand in the battles for the Iron Throne. For example, if it allies with House Stark, it could turn the tides against their enemies, freezing their forces and creating a path to victory.
Naruto is usually one of the main characters, as it's a Naruto - based fanfiction. And of course, the ice dragon is also a main character. It could be a wild and independent creature that Naruto has to tame. There might also be other Naruto characters like Sasuke or Sakura involved. Sasuke could be jealous of Naruto's new power from the ice dragon, or Sakura could be worried about the potential danger the ice dragon poses.
There could also be side characters like the dragon master's trusty dragon sidekick. This dragon might have unique abilities that help the dragon master in his adventures against the ice queen. And on the ice queen's side, she might have some ice golems or frost spirits that serve her.
It's hard to say without reading it, but it could be the ice dragon slayer themselves. Maybe there's also a wise mentor figure who guides the slayer.
Obviously, Yamoshi himself is a central character. He's the originator of the Super Saiyan God legend.
The Black Wolf itself can be considered as a main character in a sense. It has its own personality and motives within the fanfiction. Then there are the people who help the Black Wolf on its quests. This could include a young and brave knight who believes in the wolf's cause. There might also be a wise old maester who provides knowledge and guidance. And of course, there would be the villains who try to stop the Black Wolf, such as a group of bandits or a rival claimant to the throne.