Meliodas, a three-millennia-old demon, once commanded the Ten Commandments as heir to the Demon King’s throne. His youthful appearance—blond hair, emerald eyes, and a compact yet muscular frame—belies centuries of conflict. Defying his father during the Holy War, he allied with Elizabeth, a goddess, triggering dual curses: his immortality erodes his emotions with each resurrection, while she perpetually reincarnates, doomed to die without remembering their shared past.

Witnessing Elizabeth perish over a hundred times across eras, Meliodas vowed to shatter their fate. He founded the Seven Deadly Sins, a warrior group falsely accused of regicide, and later retreated to tavern-keeping while reuniting his scattered allies. Though he masks trauma with humor and loyalty, tapping into his demonic powers reignites his ruthless Ten Commandments-era persona, notably in Assault Mode, where his demeanor turns icy and violent.

His combat prowess includes Full Counter, deflecting magical assaults, and Hellblaze, corrosive flames halting regeneration. Enhanced strength, rapid healing, and darkness manipulation stem from his demonic lineage. Temporarily absorbing the Ten Commandments’ power crowned him Demon King, granting dominion over curses like Pacifism at the cost of his humanity—a state reversed when expelled of his father’s influence.

Elizabeth’s survival anchors his every choice, spurring alliances with foes and sacrifices to shield her. Haunted by razing Danafor in grief after Liz’s death, he seeks redemption by reconciling his destructive heritage with compassion. Post-Purgatory scars mark seven symbolic hearts, tempering his zeal into quiet resolve without forsaking camaraderie.

Upon breaking the curses, Meliodas abandoned his demonic might for mortal life with Elizabeth, closing a cycle of anguish. His arc spans confronting warlord guilt, defying paternal tyranny, and choosing love over dominion—culminating in renewed bonds with the Seven Deadly Sins and hard-won peace.