There might be a wise old wizard in the fanfic. He could be the one who knows a lot about the ice dragon's origin and the secrets of its power. He may guide the other characters in their interactions with the dragon.
A young girl or boy could also be a main character. They might be an outcast in their village because they are fascinated by the ice dragon, which is feared by others. This character could have a special connection with the dragon that sets them on an adventure.
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.
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.
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.
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.
Obviously, the main character would be the original character, the ice storm dragon. But there could also be characters like Issei Hyoudou. He might interact with the OC, either as an ally or an adversary. Another possible main character could be Rias Gremory, as she is a key figure in the Highschool DxD world and could have some sort of connection with the ice storm dragon OC.
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.
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.
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.
Since I haven't read it, I can't say for sure. But it could be a young adventurer, a powerful wizard, or even the dragon itself.
Well, there could be the dragon lords. One might be a powerful fire dragon lord who is fierce and protective of his kind. And on the ice side, a wise ice dragon lord who is known for her strategic thinking.
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.