Sung Jinwoo started as the weakest E-rank hunter and becomes the incredibly powerful Shadow Monarch after being chosen by a system that allows him to gain strength like a video game character. This journey involves surviving a near-fatal incident to gain the unique ability to raise an army of shadow soldiers from fallen enemies, transforming his physical appearance and abilities immensely. His mastery of skills, including dagger proficiency, stealth, and regeneration, enables him to defeat immense, ancient threats, ultimately protecting the world and evolving far beyond human limits. Sung Jinwoo possesses an overwhelming array of abilities that elevate him to the status of a godlike being. His core strength stems from his passive attributes, which grant him infinite growth in physical stats, complete immunity to all forms of poison and disease through a specialized detoxification system, and a pocket dimension inventory hidden within his shadow. As the Shadow Monarch, his signature magic is Shadow Extraction, a form of necromancy that allows him to reanimate the souls of defeated enemies into loyal shadow soldiers who retain their original combat power. He manages this massive army using Shadow Preservation and can command them with Monarch's Domain, a skill that alters the surrounding terrain and boosts his soldiers' stats by fifty percent. For high-speed mobility, Jinwoo utilizes Shadow Exchange, allowing him to instantly teleport across continents by swapping places with any active shadow soldier. His personal combat repertoire includes Stealth, which completely erases his presence and mana signature, and Quicksilver, which dramatically boosts his movement speed and evasion. He also wields Ruler's Authority, a powerful form of telekinesis that manipulates objects and enemies from a distance, and Dragon's Fear, a soul-shaking mana roar that instills absolute panic and paralysis in weaker opponents.

Kyung-Hye possesses no magical abilities or hunter powers, making her a complete civilian in a world of superhumans.. She is a deeply selfless, loving, and fiercely faithful woman who raised her two children alone after her husband's sudden disappearance inside a dungeon. Her profound impact on the narrative is defined by her tragic affliction with the "Eternal Sleep Disease," an incurable, magically induced coma caused by exposure to intense mana. Because this disease slowly drains the victim's life force while keeping them trapped in a perpetual slumber, her survival serves as Jinwoo's primary motivation for entering dangerous dungeons as the "World's Weakest Hunter" just to pay her mounting hospital bills. Even while comatose, her enduring presence shapes Jinwoo's core identity, ensuring that no matter how detached or godlike his shadow powers become, he never loses his fundamental humanity.

Sung Jin-Ah is a normal civilian with no magical hunter abilities, but she serves as a vital emotional anchor and a symbol of ordinary human innocence in a chaotic world of monsters. She is an energetic, cheerful, and incredibly hard-working high school student who deeply loves her family, showing immense maturity by balancing her studies with the stress of her mother's illness and her brother's dangerous job. Her regular routine is violently shattered during the Orc Raid at her school, where she displays incredible bravery and survival instincts, desperately trying to protect her classmates despite being completely defenseless against high-ranking monsters. The intense trauma of that event leaves her with severe psychological scars, shifting her character from a carefree teenager to a deeply anxious sister who constantly fears for her brother's safety, eventually leading her to major in nursing to help others. Because she represents the peaceful life Jinwoo is desperately fighting to protect, her safety is his highest priority, prompting him to permanently assign his strongest shadow soldier, High Orc Commander Tusk, to her shadow as an invisible guardian.

Igris is a loyal shadow general, powerful swordsman, and a former boss. He started as the Blood-Red Commander Igris before becoming Sung Jinwoo's first major shadow companion. Igris is a quiet, noble, and deeply disciplined knight who executes every command with absolute precision and silent elegance. He acts as the mature anchor of the army, prioritizing Jinwoo's honor

Beru, Originally introduced as the terrifying Ant King and the boss of the Jeju Island Raid, he becomes a loyal shadow General under the command of Sung Jinwoo. Beru is a loud, fiercely loyal, and overly dramatic warrior who views Jinwoo as a literal god and loves watching historical television dramas. In battle, he transforms into a savage, hyperactive monster who constantly competes with other shadows just to get his master’s praise.

Bellion is the Grand Marshal of the Shadow Army and the strongest shadow General. Originally born from the World Tree, he served as a high-ranking lieutenant to the original Shadow Monarch, Ashborn. Following Ashborn’s passing, Bellion emerged from a massive gate alongside the remnants of the original army to swear absolute loyalty to the new Shadow Monarch, Sung Jin-Woo.