I don't know the details of 'the monster story', so I can't say for sure. But it could be the monster itself as a main character, and maybe a human who crosses its path.
In 'the monster story', if it's a typical one, the main character would be the monster. There might also be other characters like the people in the town where the monster appears. They could be the ones who try to run away from the monster or fight it. Another possible main character could be a scientist or a hunter who is interested in the monster and wants to study or capture it.
As we don't have the full 'the monster story', it's hard to be certain. However, it's very likely that the monster is a main character. It could be joined by a young child who is not afraid of the monster and tries to understand it. There might also be a group of villagers who are affected by the monster's presence. They could be angry at the monster for ruining their crops or scaring their livestock, or they could be curious about this strange being that has entered their lives.
Chapter 196, "Sword Puppet, the First Intermediate Squad (Part 3)", is the clearest early answer because it turns Thunder Kui's situation into a concrete plot event. The chapter gives readers a real answer by opening on Only because its seemingly impossibly soft sword puppet abdomen, as... and ending on Qiu Peng was no exception, rubbing his sore arms, glancing at the....
Chapter 266, "Assessment Objective, Hell Level Difficulty", is the clearest early answer because White Bear finally turns buildup into a real advancement. It opens with No matter what the test is, the ultimate goal is for us to hunt the... and closes on Even Xiao Hen was no exception.. The key payoff is that it turns White Bear's growth into a concrete upgrade step and sets up the next payoff in the power growth storyline linked to Group.
Chapter 189, "The Provoked Xiao Hen, New House, Xia Li", is the clearest early answer because it turns Xiao Hen's situation into a concrete plot event. The chapter gives readers a real answer by opening on I remember that Lord Yue Feng's Mountain River Team was just... and ending on By all accounts, his talent was no match for Xiao Hen, and even Xiao....
Chapter 184, "Leap in Productivity, Territorial Expansion, Xia Chuan's Opportunity", is the clearest early answer because it turns Xiang Han Fruit's situation into a concrete plot event. It opens with The first time to hunt an Intermediate Snow Mane, if I remember... and closes on Leader..." Mu Dong intended to dissuade him but saw Xia Hong's face....
Chapter 254, "Alchemy, Special Envoy, Longyou", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. It opens with Solidified Fire Oil, truly a miraculous substance! and closes on This is personally ordained by our leader, and we ask Xia Hong to....
Chapter 203, "Shock, Prisoner Rules, and What Constitutes Guilt?", is the clearest early answer because it turns Wang Lie's situation into a concrete plot event. The chapter turns that into something concrete by moving from Four families, numbering five to six thousand people, gradually... to how is this possible..." Recalling what his father just said, Xiang....
Chapter 207, "Improving Corvée Labor and Changes in the First Year", is the clearest early answer because it turns Cold Resistance Level's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Inside the main hall, more than a hundred people, and tens of... and follows through with From the various materials obtained from the Cold Beast, to weapons....
Chapter 191, "Repelling the Enemy and Punishment, The 1st Wedding", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Yes, Chief!" "I'll head back to camp first." Xia Hong left a word,... and follows through with With this start, things will be easier to handle afterward....
Chapter 168, "Snow Bamboo, Longyou, Sudden Wealth", is the clearest early answer because it turns Zhu Ling's situation into a concrete plot event. The chapter gives readers a real answer by opening on Chief, the corpses from earlier have all vanished. and ending on How to manage and integrate these over three thousand people will.... In story terms, the chapter closes with "Chief, this is called Snow Bamboo. The spiky layer outside can autonomously sense and attack enemies from the front.
Chapter 167, "Seizing the Mirror, He Yuanhun's Confidence", is the clearest early answer because it turns Beast Blood's situation into a concrete plot event. The chapter gives readers a real answer by opening on From the moment he emerged, the Mirror Immortal Camp was no longer a... and ending on From 300,000 jin, it directly soared to 900,000 jin..