I'm not sure exactly who the main characters are in the 'krampus 2015 graphic novel', but surely Krampus himself is one of the main characters as the story is named after him.
Since it's a graphic novel about Krampus in 2015, Krampus is likely the central character. There may also be some human characters, perhaps children who are the targets of Krampus' wrath or adults who try to protect the children from him or deal with his presence in the town.
In the 'krampus 2015 graphic novel', Krampus is bound to be a main character. He is the key figure in the Krampus lore. Besides him, there could be a family as main characters. For example, a father who is skeptical about the existence of Krampus, a mother who is more superstitious and tries to keep the family in line during the Christmas season to avoid Krampus' visit, and their children who might either be naughty or nice, which would determine their encounter with Krampus.
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