Estarossa emerges as a high-ranking demon within the Ten Commandments, later unmasked as Mael—an Archangel of the Goddess Clan. His identity was forged three millennia ago during the Holy War when the original Gowther’s forbidden spell rewrote reality, implanting false memories of him as the Demon King’s second son and sibling to Meliodas and Zeldris. Bestowed with the Commandment of Love, he neutralizes adversaries harboring hatred in his vicinity.

As Estarossa, he engages in pivotal battles, reviving the Ten Commandments and igniting the New Holy War. Absorbing multiple Commandments triggers volatile physical and mental decay as his Goddess essence clashes with demonic power, culminating in a fractured Hybrid form worsened by the Demon King’s attempted possession. The spell’s eventual collapse restores his true self: Mael, wielder of the Grace of Sun, commanding searing heat and unleashing miniature suns.

After the Demon King’s fall, Estarossa stabilizes by reabsorbing four Commandments, harmonizing them with his Grace to perfect a Hybrid state blending divine and demonic forces. He crafts a golden longsword from Escanor’s Rhitta, imbuing it with solar-energy storage as a homage to his fallen ally.

His demeanor oscillates between the Goddess Clan’s serene composure and a demon’s erratic ferocity when defending kin or clan. Combat prowess spans Full Counter—reflecting and amplifying physical strikes—Hellblaze flames, and merged light-dark techniques like Twin Light and Dark Blades.

Post-war, he briefly governs the Goddess Clan’s domain before founding a Hybrid Clan on a distant continent, prioritizing reconciliation and legacy. His efforts focus on mending a fractured world, symbolizing unity through his tributes and leadership.