A hardcore completionist gamer who spent a decade clearing the hell-difficulty settings of Aether World before transmigrating into the body of an incurable extra. Afflicted with the terminal Mana Revelation Delay Physique, Yuseol possesses precisely zero usable internal mana and operates under an absolute two-year lifespan countdown. Highly analytical, stoic, and relentlessly pragmatic, he compensates for his biological handicap by weaponizing absolute meta-knowledge, spatial manipulation, and peak physical conditioning. Rather than pursuing personal glory, he systematically restructures the timeline, preventing the catastrophic downfalls of the original game's heroines and eliminating dark demonic infiltration before the continent is ruined. Powers: Master of the non-magical spatial maneuver Blink, which permits instantaneous repositioning along visual vectors with near-zero cast time. Wields the shapeshifting magic-conductive sword derived from the ancient Terivon Staff, enabling him to physically slice through hostile mana pathways and nullify spell sequences. Practitioner of the Taeryung Divine Arts to stabilize his decaying internal organs. Formed a primal soul contract with Deity Iphanel and commands high-tier alchemical items.

Princess of the powerful Adolebit Kingdom and an ostensibly ruthless fire-attribute prodigy. Raised in an emotionally abusive royal court that demanded cold, flawless perfection, she initially viewed magic merely as a calculated hierarchy of royal superiority. After Yuseol breaks through her rigid textbook mentality, she sheds her toxic familial conditioning and develops fluid, self-expressive pyromancy. Fiercely proud, protective, and intensely tsundere, she becomes deeply devoted to Yuseol, vowing to ascend the throne of Adolebit and secure the sacred royal Fire Spirit Flower to cure his terminal condition. Powers: Exceptional fire magic bloodline; commands ultra-dense incendiary arts, blazing barrier manifestations, and adaptive flame manipulation. Capable of unleashing continuous offensive barrages that scorch entire arenas.

The eldest daughter of the tragic, disgraced Molf Grand Duchy. Following the destruction and bankruptcy of her household, Aiselle entered Stella Academy carrying the burden of massive debt, social isolation, and vicious aristocratic ridicule. Originally destined for a tragic demise as a dark villainess in the original timeline, her fate is rewritten when Yuseol intervenes, providing her with financial backing, combat advice, and genuine companionship. Modest, fiercely hardworking, and gentle-hearted, she blossoms into one of Stella's most terrifying dual-element mages. Powers: Dual affinity for Ice and Lightning magic. Renowned for manifesting the signature spell Crystal Flower, an explosive cryo-barrier and piercing projectile art. Employs instinctual, non-calculated casting methods taught by Yuseol to bypass traditional mental calculation delays.

A soul transmigrated from modern Earth who replaced the original canonical novel heroine. Possessing an instinctive understanding that the world's narrative has deviated violently from its designated path, Flame is hyper-vigilant, perceptive, and morally resolute. Recognizing Yuseol's bizarre anomalies, she identifies him as a fellow actor outside the narrative framework. In order to shield herself from the predatory, politically coercive romantic advances of Crown Prince Jeremy, she forms an official fake-dating pact with Yuseol, leading to unexpected emotional vulnerability. Powers: Wielder of rare Light Attribute and Purification Magic. Her spells completely neutralize dark demonic corruption, dispel high-grade curses, regenerate shattered biological tissue, and counter mental-interference hexes.

The canonical protagonist of Aether World. Born into the continent's most exalted martial-magic lineage, he naturally possesses an unparalleled 9-Star mana talent and omni-elemental affinity. Despite standing at the pinnacle of talent, his godlike status alienated him from genuine human bonds, leaving him profoundly lonely and emotionally isolated. When Yuseol approaches him without sycophancy or fear, inviting him to form the mundane "Delicious Restaurants Club," Yuseong finds true purpose and unshakeable brotherhood, constantly stepping into danger to defend his peers. Powers: Unrivaled 9-Star mana potential; multi-elemental mastery spanning fire, earth, wind, and lightning; seamless parallel processing of high-tier 5th and 6th Class destructive spells; formidable physical combat prowess.

An esteemed alchemy professor at Stella Academy whose internal jealousy, academic stagnation, and twisted ambitions left her ripe for dark demonic erosion. Serving as an undercover operative for demonic factions, she routinely sabotages non-compliant students, steals breakthrough formulas from her assistants, and facilitates demonic seed implants across Arcanium. Cold, narcissistic, and calculating, her facade finally crumbles into monstrous bloodlust when Yuseol systematically exposes her academic fraud and ruins her status. Powers: High-tier corrosive alchemical arts, volatile toxic dispersion, and high-class demonic transformation. When fully demonized at the World Tree roots, she commands regenerative flesh tendrils, acidic miasma spheres, and lethal biological domain shifts.

A timid, brilliant assistant professor whose groundbreaking alchemical research was continuously suppressed and claimed by Professor Maizen. Timid and demoralized, she was on the verge of resigning before Yuseol recognized her latent genius and supplied the missing mathematical parameters to solve the historic 300-year-old alchemical impasse. Following her vindication, she transforms into an authoritative, world-renowned scholar and Yuseol's most lucrative industrial partner. Powers: Unrivaled genius in magic engineering and theoretical alchemy. Perfected the Random Sequence Convergence Technique, an alchemical formula enabling mass production of previously impossible high-density potions and mana capacitors.

A hyper-competitive, deeply insecure first-year prodigy hailing from a distinguished family who lived permanently in the shadow of Ma Yuseong. Consumed by an obsessive need to surpass Yuseong and secure first place in academic rankings, his wounded pride made him exceptionally vulnerable to external manipulation. He becomes an easy target for Professor Maizen, who infects him with dark demonic essence, reducing him to a weaponized thrall during the sacred World Tree expeditions. Powers: Exceptional elemental spear arts fused with aggressive mid-tier spellcasting. When demonized, his physical threshold scales exponentially, granting him unhinged regenerative speed, manic dark-mana bursts, and piercing trajectory strikes.

An arrogant senior nobleman of the prestigious Atalek family who uses status, wealth, and systemic seniority to exploit underclassmen and expand his political web. Entrenched in aristocratic chauvinism, he attempts to assert dominance over Baek Yuseol while politically isolating Hong Biyeon. Convinced of his intellectual supremacy, he arrogantly challenges Yuseol to an absolute public match of Soul Chess, only to experience complete psychological and strategic destruction. Powers: High-tier mental calculation, aristocratic sword-magic, and advanced tactical execution within magical strategy games such as Soul Chess.

The sovereign leader of Stella Academy and one of the realm's most revered archmages. Discerning, enigmatic, and deeply invested in the survival of the realm, Eltman maintains order over Arcanium's complex political landscape. While recognizing the deep oddities in Yuseol's physiological profile and records, he chooses to facilitate the boy's growth rather than restrain him, recognizing Yuseol's pivotal role in combating the impending dark calamity. Powers: 8th-Class Archmage commanding transcendent spatial and planar enchantments; absolute barrier creation; immense sensory omniscience spanning the perimeter of Stella Academy.

A primeval spirit entity whose power and physical form had withered into near-extinction across millennia of planar neglect. Infiltrating her forgotten sanctuary, Yuseol utilizes ancient game lore to preserve her lingering consciousness. After receiving the Spiritual Creature's Heart recovered from the World Tree demonic catastrophe, she successfully reincarnates into a physical vessel, entering into an unbreakable symbiotic soul contract with Yuseol to keep his collapsing body alive. Powers: Primeval spirit physiology; commands pure, uncorrupted spiritual life-force, absolute nature manipulation, stealth concealment, and direct soul-link stabilization that supplements Yuseol's hollow mana circuits.

An influential senior student and high-ranking noblewoman respected for her level-headed diplomacy, academic mastery, and fair judgment. Operating during the Junior Cultivation Sessions, she refuses to yield to the bullying tactics of Edmund Atalek's clique. Impressed by Yuseol's fearless demeanor and unconventional intellect, she provides institutional legitimacy and backing for his high-stakes challenges against aristocratic corruption. Powers: Advanced barrier and defensive abjuration spells; high-level tactical coordination; sophisticated aristocratic swordsmanship.

The imperial heir who operates beneath a polished veneer of charismatic royal grace that hides predatory narcissism and ruthless political ambition. Viewing the uniquely gifted Flame as an essential political trophy and divine battery for his future reign, he relentlessly corners her using royal authority and societal pressure. His plans are thoroughly disrupted when Yuseol steps in as Flame's supposed romantic partner. Powers: Immense imperial mana capacity; high-tier royal elemental casting; complete command over royal knights, imperial intelligence webs, and national resources.