Well, surely Krampus and St Nicholas are main characters. Krampus, a horned and hairy beast - like figure, is the one who brings fear. St Nicholas is the jolly and good - natured figure. But there could also be other characters. Maybe there are some elves or helpers associated with St Nicholas who play a role in the story. And there could be a particular child or a group of children who are the focus of Krampus's attention. The graphic novel might also introduce some unique characters specific to its own interpretation of the Krampus and St Nicholas lore.
The main characters are probably Krampus and St Nicholas. Krampus, with his menacing appearance and role as the punisher of naughty children. St Nicholas, on the other hand, is the symbol of kindness and gift - giving. There may also be other characters like the children in the village who are either in fear of Krampus or looking forward to St Nicholas's visit, and perhaps some adults who have their own stories and reactions to these two iconic figures in the graphic novel.