In 'great poogie monster hunter stories', the main character is surely the Poogie. It is the focus of these stories after all. But in addition to that, the hunters in the Monster Hunter world can't be ignored. They are the ones who explore the world, fight monsters, and the Poogie may be associated with them in some way. Maybe there are also some elder or wise characters in the game's lore that play a role in the Poogie's story, such as an old hunter who gives advice related to the Poogie or a village elder who has knowledge about the special nature of the Poogie.
The main character is likely to be the 'great' Poogie itself. However, in the context of Monster Hunter, there could be other important characters too. Hunters who take care of the Poogie or go on adventures with it might be considered main characters. Also, there could be some key monsters that the Poogie has a special relationship with, like a monster that the Poogie befriends or has some sort of encounter with that drives the story forward.