I don't know for sure since I don't have the details of this particular story. But usually in a sea cave horror story, there could be explorers or fishermen who accidentally stumble upon the cave.
I'm not sure specifically without more information about the story. It could be a group of explorers, perhaps some young and adventurous friends.
I'm not sure specifically as there could be many sea cave horror stories. It might be about people getting trapped in a sea cave, facing some unknown and terrifying creatures lurking in the dark corners of the cave, or perhaps it involves strange noises and apparitions within the cave that drive people to madness.
In many cave - related stories, there could be an explorer as a main character. In the 'Misery Cave Story', it might be an adventurer who ventures into the cave out of curiosity or in search of something valuable. There could also be a guide who is supposed to lead the way but maybe things go wrong. Another possibility is that there is a lost hiker who stumbles upon the cave and becomes part of the story.
As the story isn't known to me, the main characters might be a group of friends who decide to explore the dark cave out of curiosity. Or it could be a solitary adventurer seeking solitude or a particular treasure hidden within the cave.
There could be an explorer as a main character, who is the one to enter the cave and face the monster.
In some 'cave man stories', there could be a hero - like a cave man who saved the group from a big predator. He became a symbol of courage for the whole community. And there might be the shaman - like figure who was believed to have some special connection with the spiritual world and could perform certain rituals for the well - being of the group.
There could be an explorer. They are often the ones who dare to enter the cave and face the monster.
It might be a group of friends. You know, they hear about the spooky cave and decide to check it out for fun or out of curiosity. They could be young and naive, not fully realizing the danger they are getting into, and then they have to face all kinds of scary things in the cave together.
Perhaps the main character is a curious individual, like a child or a young adult. And there might be some animal characters as well that he encounters during his adventure in the cave.
I don't know specifically as we don't have much information about this 'Balrog Cave Story'. But it could be a hero who dares to enter the cave where the balrog lives.