Since it's a story about kendo and has a harem and colosseum elements, the main character might be a reincarnated individual. He could be a person with a natural aptitude for kendo. There might also be female characters who are part of the harem, perhaps some of them being skilled kendo practitioners themselves or having other unique abilities that draw them to the main character. Maybe there's a mentor - like figure as well who helps the main character in his kendo journey and in dealing with the challenges of the colosseum and the harem.
I don't have specific information on the main characters as I haven't read the light novel. It could be a young male protagonist given the common tropes in harem - themed stories.
Without having read the 'Tensei Kendo no Harem Colosseum Light Novel', it's difficult to say exactly who the main characters are. However, based on the title, we can make some assumptions. The main character is likely someone who has been reborn (tensei) into this world. In a harem - based story, he would be the center of attention for multiple female characters. In the context of kendo and the colosseum, he might be a fighter or a student of kendo. There could be rival characters, both male and female, who oppose him in the colosseum or in his relationships. And of course, the female characters in the harem would also play important roles, each with their own personalities and backstories that would interact with the main character's story.
Chapter 362, "He's Something Else", is the clearest early answer because it turns Damien's situation into a concrete plot event. The chapter turns that into something concrete by moving from [Kill Count: 5,000 / 5,000] [Sixth Summon Slot – Acquired] The wind... to I'm done." "Luton, clean up the corpses and if you feel like joining.... What makes it stick is that the chapter closes with Arielle didn't know when she muttered.
Chapter 486, "Helping A Village", is the clearest early answer because it turns Damien's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The village lay in a shallow basin between two low hills, its fields... and follows through with Damien walked on, silent as the dawn crept across the land..
Chapter 436, "The Gate Hidden In The Forest", is the clearest early answer because it turns Damien's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The light over the Verdant Verge dimmed as evening crept in, the... and follows through with We'll be ready." And with that, the wyvern's shadow rose around him,....
Chapter 283, "Defending Westmont II", is the clearest early answer because it turns Raegon's situation into a concrete plot event. Early on, Seeing how things were going to turn out if he didn't take control of.... By the end, But then, as the massive figure began its rapid descent, realization....
Chapter 385, "Tell Me Where", is the clearest early answer because it turns Razel's situation into a concrete plot event. Early on, The moon was high, almost reaching it's peak by the time Razel Acheon.... By the end, Draped in deep charcoal with silver trim.. Inside the broader family politics storyline, the chapter closes with "Tell me where. Now., which gives faction conflict a stronger narrative position and pushes the power growth onward.
Chapter 282, "Defending Westmont I", is the clearest early answer because it turns Westmont's situation into a concrete plot event. The setup is ~An Hour Earlier~ Lord Raegon's army marched forward, their..., but the pressure keeps building through The sheer size of the approaching army was enough to make lesser men....
Chapter 410, "Searching For Answers", is the clearest early answer because it turns Damien's situation into a concrete plot event. The setup is As usual, Delwig stirred with early morning life, but Damien and..., but the pressure keeps building through Fenrir padded along the dirt road, the massive wolf quiet despite his.... Once the chapter lands on Finally, as the sun dipped lower, they reached a clearing., the chapter closes with Damien clenched his fists, forcing his fury into focus.
Chapter 63, "Dead... Dead?", is the clearest early answer because the violence around Yuan Cheng becomes final instead of hypothetical. A useful checkpoint is the way the scene starts with Although the Wood Puppet Monster's body has enlarged, it still... and follows through with Laughing while retracting its black blade from the ground, placing it....
Chapter 232, "This Isn't A Dream II", is the clearest early answer because it turns Damien's situation into a concrete plot event. The setup is Damien pushed through the thick fog, his steps purposeful as he..., but the pressure keeps building through Fenrir remained by his side, its ears perked and alert, though even.... Once the chapter lands on Fenrir…" Damien whispered, his heart sinking as the wolf's stance..., the chapter closes with With that, the world around him began to fade.
Chapter 268, "Assembling A Team Of Four", is the clearest early answer because it turns Damien's situation into a concrete plot event. The chapter gives readers a real answer by opening on Damien emerged from the teleportation array, blinking against the... and ending on As they entered the Dean's office, the first thing Damon noticed was....