The main characters in the 'north ranger graphic novel' are probably the titular north ranger. He or she could be joined by a group of friends or comrades, like a local tribesperson who knows the secrets of the land, a scientist studying the unique flora and fauna of the north, and a young apprentice ranger who looks up to the main character. Together, they might face various challenges and adventures in the northern setting.
I don't know the exact main characters in the 'north ranger graphic novel'. But it could be the ranger themselves, perhaps a sidekick like a loyal animal or another ranger.
In the 'north ranger graphic novel', the main character is likely the north ranger. There might also be a mentor figure, an old and wise ranger who has taught the protagonist everything he or she knows. Additionally, there could be an antagonist, like a poacher or a villain who wants to destroy the northern environment that the ranger is trying to protect.