The main character in the 'the good life fisherman story' is undoubtedly the fisherman. He is the one whose life and actions form the core of the narrative. There could potentially be other characters such as the people he interacts with in the village, perhaps those he sells his fish to or his friends at the dock. But the fisherman is the character that the story is mainly about, and through his perspective, we are likely to understand the concept of 'the good life' as presented in the story.
In the 'the good life fisherman story', the most prominent character is the fisherman. There might be other minor characters like his family members or fellow villagers who could be part of the story's backdrop, but the fisherman is the central figure around which the story revolves.
The main character is likely the fisherman himself.