Arc began as an unnamed gamer who drifted into sleep during an online RPG session and awakened in a fantasy realm, trapped within his in-game avatar: a skeletal knight draped in formidable armor and armed with legendary weapons. His bony visage stemmed from a cosmetic skin bought to personalize his avatar, a guise he initially hid to prevent public terror. This cursed form dulls complex emotions like guilt and fear, yet he paradoxically retains human necessities—breathing, eating, sleeping—despite lacking fleshly organs. Temporary respite comes through immersion in enchanted hot springs, which unveil his hidden elven body with brown skin. Sustaining this form demands prolonged exposure, and the abrupt flood of long-suppressed emotions during transformations can overpower him, triggering unconsciousness.

Upon arriving in this new world, Arc embraced his avatar’s name and roamed as a wandering hero, aiding those in peril. Early exploits saw him rescue a noblewoman from bandits, free enslaved elves, and befriend a mischievous spirit fox, Ponta. Driven by an unwavering moral code, he opposes slavery and corruption, forging alliances with figures like Ariane Glenys Maple, a dark elf warrior, and Chiyome, a beastfolk ninja. Though gifted with extraordinary strength and magic—teleportation, healing, resurrection, summoning—his inexperience in actual combat sometimes leaves him exposed against adept foes. He bridges this gap with ingenuity, repurposing objects or drawing on mundane Earth knowledge to outwit adversaries.

Arc’s crusade focuses on dismantling slave trade rings tied to entities like the Holy Hilk Kingdom, intertwining him with elven and beastfolk resistance movements. Acceptance within the elven village Lalatoya earned him its name as a surname, marking his trusted status. Fleeting transformations into his elf shape briefly expose buried emotions—rage, longing for home—though these glimpses fade swiftly. Gradually, he navigates the duality of his existence: a cursed skeleton seeking anonymity, yet an inadvertent revolutionary whose actions reshape politics and draw unwanted attention through overwhelming displays of power.

Cheerful and courteous, Arc deflects praise for his deeds, avoiding confrontation unless innocents are endangered—then acting with lethal precision. His gentle nature contrasts starkly with his fearsome frame, evident when elven children dub him "Mister Armor" without hesitation. Though seldom dwelling on his Earthly past, his fascination with the fantasy world’s rules and lore hints at his gamer roots. While episodic trials test him, his core identity remains steadfast, balancing heroism with the unintended ripples of his presence.