Seth, a young sorcerer bearing white horns from a Nemesis infection, endured childhood persecution that led to violent ostracization. Rescued by Alma, a seasoned Nemesis hunter, he grew isolated from society, ignorant of institutions like the Inquisition and prone to reckless impulsivity—evident when he once attacked a cow mistaken for a Nemesis, devastating Pompo Hills. His sheltered upbringing under Alma’s moral guidance shaped his resolve to eradicate Radiant, the mythical origin of Nemeses, believing its destruction would end discrimination against sorcerers.

Experiences in Rumble Town tempered his idealism, exposing systemic oppression’s complexities. Though determined to reject the monstrous identity others imposed, he grappled with moral ambiguity, notably after confronting Konrad, whom he mistakenly believed he killed. Physically enhanced beyond human limits, Seth wields Fantasia energy for close combat, unleashing techniques like Titan Punch without magical tools—a rare trait initially hidden by gloves. Training with Yaga and Myr honed his control, evolving his skills to conjure Repulse shields and Skull Burst projectiles. A volatile Berserk Mode, activated by removing his cheek bandage, grants overwhelming power at the risk of rationality, though mentorship later helps him harness it.

Key allies anchor his growth: Alma, a maternal mentor; Mélie, a dual-natured sorcerer facing similar stigma; Doc, a reluctant companion turned loyalist; and Ocoho, a knight-sorcerer who broadens his perspective on political strife. These bonds steer him from impulsive acts—like recklessly hatching a Nemesis egg—toward strategic leadership, deepened by Myr’s teachings in the Caillte forest. There, he gains Green Thumb abilities, symbolizing his shift from destruction to creation.

Trauma fuels his journey: childhood flashbacks reveal peers stabbing him for his “demon’s mark,” while Hameline’s death triggers a crisis of faith. Struggling with identity and persecution’s psychological toll, he balances idealism with harsh realities, striving to forge coexistence between sorcerers and humans. His evolution—from naïve heroism to systemic advocacy—underscores a commitment to challenging prejudice without becoming the monster fear painted him to be.