Inyō operates as an Angler on the newly emerged continent of Magmell, specializing in search and rescue for adventurers endangered by the perilous land. This 16-year-old male has jet black hair and golden hazel eyes. His typical attire includes a tan uniform with rolled-up sleeves, black boots, a black belt and tie, and a hat featuring three gray pins depicting Toto—a creature design created by his mentor, Shuin. A golden badge signifying his official Angler status is affixed to his left side.

Born in Magmell, Inyō possesses innate superhuman physical capabilities: exceptional strength, endurance, flexibility, and speed. These enable feats like rapid movement resembling teleportation, withstanding amplified physical strikes, and single-handedly lifting massive creatures.

He wields the specialized ability "Lacht," allowing him to materialize and psychokinetically manipulate objects. This power requires comprehensive understanding of an object's internal mechanics and material composition. Manifestation involves generating grey-white electrical-like light, formed into spheres until the object materializes. Commonly created items include cutting tools, bludgeoning weapons, grenades, miniguns, and occasionally plants or structural platforms. His application of Lacht evolves during missions, shifting from initial reluctance toward more open use in rescues. Consistency in the ability's mechanics or limitations remains undefined across documented events. [citation:]

Personality-wise, Inyō balances sharp observation with a generally relaxed demeanor, preferring deliberate execution over rushed actions. He approaches rescues with high commitment but typically demands large sums of money for services, a trait some label cruel or opportunistic. Despite this, he maintains strong familial loyalty and occasional vulnerability to guilt-based persuasion. Moments reflecting his age emerge through impulsive or crafty behaviors, like deceiving merchants such as Den-Den for discounts. Mentions of Shuin trigger visible distress, hinting at unresolved tensions.

Key relationships define his background and motivations. Zero serves as his partner and support operative, using her own Lacht abilities remotely via a drone for reconnaissance, transport, and combat. Their bond stems from his childhood rescue of her from an entity named Barton and a subsequent recapture incident—protection guided by a directive from Shuin prior to his disappearance. Zero harbors romantic feelings toward him, though his awareness or reciprocation is ambiguous. Their dynamic fluctuates between mission coordination and lighter moments.

Shuin, his mentor and former guardian, profoundly shaped his development. Residing together during Inyō's youth, Shuin taught him Lacht techniques, permitted him to keep Toto as a pet, and crafted the pins he wears. The circumstances of Shuin's departure remain undisclosed, but his absence continues to affect Inyō emotionally. He annually cleans their shared former residence, hoping for Shuin's return. A driving ambition involves surpassing Shuin's legendary Lacht proficiency.

His background intersects with Magmell's indigenous elements, including an incident where the creature Toto became uncontrollable while Shuin was present. Later narrative developments involve confronting antagonists linked to Zero's past, intensifying his protective instincts amid heightened stakes.