In many aspects, 'The Iceman' is true. It draws inspiration from actual cases and characters, but some artistic liberties might have been taken for dramatic effect.
In many fanfictions, Iceman starts as a bit of an outsider in the Avengers. But as he faces challenges together with the team, he grows in confidence. He might start to take more risks and use his powers more creatively. For instance, he could learn to create ice sculptures that can act as decoys in battles from his time with the Avengers. This not only helps in combat but also shows his growth as a character who can think on his feet.
In 'The Iceman: A Novel', it could be that the Iceman is a special figure in a fictional world. He might possess unique abilities or powers related to ice. The story could unfold as he discovers more about himself and his place in the world. It might involve other characters who either befriend him or oppose him, and through their interactions, the plot develops. There could be a whole backstory about how he became the Iceman, whether it was through some sort of accident, a curse, or a gift. And as the story progresses, we might see him face various challenges and grow as a character.
One of the best iceman stories is about Ötzi the Iceman. He was discovered in the Alps, perfectly preserved. His story gives us a unique glimpse into the life of a man from a very long time ago. We can learn about his clothing, which was made from different animal skins. His tools, like his axe, tell us about the technology of that era.
I'm not entirely sure which specific 'iceman' is being referred to in a 'Christmas story' without more context. There could be a local or regional character in a particular Christmas story that I'm not familiar with. It might be a character created for a very specific community's Christmas traditions or a more niche piece of Christmas literature.