I just finished reading 'Tyrant's Tranquilizer' last week and have been turning it over in my head. The story is a tough one for pinning down a single antagonist. Most people online seem to default to saying the Emperor, Zayne, is the main villain because, well, he's the tyrant. But I don't think that's entirely fair to the narrative. He's more of a tragic figure shaped by his own trauma and paranoia, a product of the corrupt imperial system. The real antagonistic force feels more systemic—the entire court politics, the expectations of power, and the cycle of violence that ensnares both Zayne and the female lead, Elara. She's literally his 'tranquilizer,' his human sedative, which creates this horrible, intimate conflict where the person trying to calm the beast is also his prisoner. Their dynamic is the core conflict, not a simple hero-vs-villain setup.
If I had to name a character who embodies that systemic evil, it might be Grand Duke Valtor, the scheming uncle. He's the one pulling strings in the background, fueling Zayne's worst impulses for his own gain. But even he feels like a symptom. So, the main antagonist? It's the throne itself, and the damage it does to everyone who gets near it. The ending really drives that home, with the cost of their 'tranquilized' peace.