Age: 16 years oldRole: The main protagonist of the series and the twin brother of Asa. He is the master of the legendary Divine Guardian Daemons, Left and Right.Personality: Calm, deeply selfless, and hyper-perceptive. Having spent his entire life in an isolated mountain village hunting wild game, he possesses a cautious, tactical "sugar-and-ice" disposition. He rarely asks for anything for himself, directing his fierce loyalty entirely toward protecting his sister and those he considers family.Quirks & Abilities: While he is easily shocked and confused by modern lower-world technology, his survival instincts are top-tier. He is an expert archer and a brilliant tactician who can read an opponent's physical movements instantly. He handles lethal threats with immediate, cold, and definitive action, never hesitating in a fight.

Age: 16 years old (Yuru's younger twin sister).Role: The co-protagonist representing the "Day", currently aligned with the Kagemori clan. She possesses a supernatural right eye hidden under an eyepatch.Personality: Resilient, tough, and fiercely determined, but emotionally complex. Because she grew up in the modern "lower world" and survived immense trauma—including being assassinated, briefly dying, and reviving—she carries a heavy, vengeful edge against those who harmed her family. To strangers, she presents a masculine, stern, and cool facade. However, around Yuru, her tough exterior completely evaporates into a massive, comically emotional "brother complex," dissolving into tears and frantic, dramatic gestures because she is so devoted to him.Abilities & Quirks: Asa commands the god-tier power of "Break" (Kai). Obtained at the boundary of life and death, it allows her to dismantle physical objects, shatter magical barriers, and completely sever the contracts between other masters and their Daemons. Despite her overwhelming power, she has a deep-seated fear of being left alone in the dark. Like Yuru, she shares the wild, eccentric belief that all children should constantly carry weapons for self-defense

Age: Centuries-old immortal.Personality: Aggressive, highly vocal, and sharp-witted. Left loves a good brawl and takes a lot of pride in Yuru's skills. She is the more talkative of the pair and is quick to analyze an opponent's physical weaknesses while taunting them mid-combat.Abilities: Functions as Yuru’s primary offensive weapon. Left can manifest as a giant, stone-like disembodied arm capable of delivering devastating, crushing blows, deflecting projectiles, and tearing through enemy defenses. Gender:Female

Age: Centuries-old immortal.Personality: Stoic, grounded, and intensely protective. Right is much more quiet and disciplined than Left. He treats Yuru with a mixture of strict parental duty and immense pride, acting as the rational anchor that keeps the trio focused during chaotic situations.Abilities: Functions as Yuru’s absolute shield. Right focuses heavily on high-level defensive barriers, sensory tracking to spot hidden threats, and coordinated crowd control to keep Yuru completely safe from harm Gender:Male

Age: 35 years oldRole: A former mercenary and undercover operative who acts as Yuru’s shady but reliable guide into the modern lower world.Personality: Carefree, street-smart, and practical. He often presents himself as a lazy, gambling traveling merchant to hide his true competence. While he acts casual and avoids domestic chores, he is deeply intelligent, intensely protective of Yuru, and highly cautious when navigating deadly underworld politics.Abilities: An expert in espionage and urban combat. He uses his extensive network of contacts to gather intelligence, commands a specialized vehicle for stealth operations, and displays top-tier survival instincts when caught in crossfires between rival Daemon clans.

Age: Mid-20s.Personality: Direct, short-tempered, and exceptionally reliable. She acts tough but is deeply protective of youth.Abilities: A skilled physical brawler who uses brass knuckles. She commands the scouting Daemons Kotetsu and Jiro.

Age: Late 20s.Personality: Calculating, eccentric, and always hides his lethal intent behind a polite, casual smile.Abilities: Commands the Daemons Ai and Makoto, using them as a pocket dimension to instantly summon weapons.

Age: ~15.Personality: Energetic and trendy, but sadistic and bloodthirsty in battle. She is fiercely loyal to Asa.Abilities: Commands "Gabriel," a terrifying floating mouth of razor-sharp teeth that eats through anything.

Age: Early 20s.Personality: Dutiful, formal, and fiercely disciplined. He values martial honor and clean strategies over deception.Abilities: Commands a rabbit-and-tortoise Daemon pair to blend high-speed martial strikes with crushing, heavy weight

Age: Late 30s.Personality: Ruthless, opportunistic, and highly manipulative. He orchestrates chaotic ambushes behind the scenes.Abilities: A master strategist who uses the friction between rival clans to isolate and corner the Twins.