There's no way to know exactly without reading the graphic novel. However, it's likely that Mike is a central character. There might also be a cast of regulars at Mike's place, like the bartender if it's a bar, or the neighbors if it's a home. They could all play important roles in the story, with their own personalities, goals, and backstories.
Since I haven't read it, I can't say for sure. But it could be Mike as one of the main characters, and perhaps his friends or family members who are often at his place.
We don't really know who the main characters are in 'Mike's Place Graphic Novel' without more information. But if it's about a place, there could be the owner of the place, Mike, and then people who are associated with the place in different ways. Maybe there's a love interest for Mike, or a rival in business if it's a commercial place. There could also be some sort of mentor figure or a troublemaker character who shakes things up at Mike's place.
Chapter 332, "Start the Live Stream!", is the clearest early answer because it turns Music Domain's situation into a concrete plot event. The chapter turns that into something concrete by moving from His hands shaking, Jiang Shixu reopened the video.
Chapter 537, "Ding, Jiang Cheng's affinity drops by 10 points!", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event.
Chapter 374, "From Now On, Jiang Li Calls the Shots in Golden Sand!", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. Early on, Jiang Li's bold behavior infuriated Jin Siyue, but it also succeeded....
Chapter 639, "Young Master Gu, Does Your Family Need a Dog?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Half an hour later, Jiang Li pushed open the door and walked out.
Chapter 526, "Has Jiang Li Turned Evil?!", is the clearest early answer because it turns Turned Evil's situation into a concrete plot event. Early on, At seven in the morning, the livestream began, and most of the.... By the end, We definitely can't take everything;
Chapter 770, "You're Actually Speaking Up for Her?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 536, "Truth or Dare", is the clearest early answer because the hidden truth stops feeling like mere subtext. A useful checkpoint is the way the scene starts with Yu Li first fell silent for a while, then slowly began to speak.
Chapter 352, "Furong Cake", is the clearest early answer because it turns Miss Liu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Finding Liu Suqing's address was not an easy task.
Chapter 525, "Help It Transcend", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from The forest at night was still quite damp and cold.