Seras is a noble warrior who supports Touka, offering emotional balance and strength through their evolving bond.
The monster prince is a cursed royal surrounded by fear and tragedy, whose icy heart begins to thaw thanks to an unlikely companion.
Eleanor is a formidable and mysterious figure, acting as both antagonist and complex love-interest in Dowd’s journey.
Tiarozety Isol is a transmigrated reader who becomes the story’s protagonist after a twist of fate—armed with knowledge and sarcasm.
Ushio’s grandfather is the origin point of the family's mermaid vow, binding generations to a mystical past.