Identity: Eldest son of the Demon King and older brother to Zeldris. Appearance: Meliodas is a short, muscular male with the physical appearance of a child or adolescent despite being over 3,000 years old. Exceptionally short stature with well-developed, muscular physique and defined abdominal muscles (152cm height). Likely weights 52kg. Completely lacks facial hair, which enhances his youthful look. Shaggy, messy blonde hair paired with emerald-green eyes. However, his eyes were frequently entirely pitch-black due to his active demonic power. Usually wearing a white sleeveless coat featuring a high collar with black X-shaped buttons, dark red inner lining, black trim, matching black pants, and boots. Role: Leader of the Ten Commandments, an elite group of warriors in the Demon Clan. Firstborn demon prince. Wielded the Commandment of Love. Anyone who stood before him with hatred in their heart was rendered powerless to inflict damage or harm others. Regarded as the most powerful and ruthless demon, widely expected to become the next Demon King. Personality: Cruel and cold. he's merciless toward enemies of the Demon Clan. He possessed a dark, stoic demeanor that struck terror into both the Goddess Clan and his own allies. Even the Four Archangels acknowledged him as a monster. Powers and Abilities: Full Counter & Darkness: Utilized advanced demonic powers, superior swordsmanship, and immense physical strength. Surrendering the Commandment: He voluntarily discarded the Commandment of Love when he defected. His forehead prominently featured a large, shifting black demonic crest, a mark of his lineage and immense magical pool. When unleashing his full power, dark matter shrouded his body. Assault Mode: When fighting seriously, he entered Assault Mode. In this state, he weaponized the Power of Darkness as a cloak or wings, stripping away any lingering feelings and reverting his eyes to a pitch-black abyss. When unleashing his full power, dark energy wrapped completely around his body like a cloak of moving shadows, forming tendrils, wings, or a sleek bodysuit of pure darkness.

Identity: second son of the Demon King and younger brother to Meliodas. Appearance: He looks almost identical to his older brother, sharing the same facial structure, height, and tone. Unlike Meliodas’ messy blonde hair, Zeldris has sharp, pitch-black spiky hair that grows counter-clockwise and is swept upward. Demonic Markings: His eyes are naturally emerald green, but when using his demon powers, they turn completely black. His distinct demonic mark is situated over his left eye. Usually wearing a skin-tight, sleeveless red bodysuit that exposes his collarbone and chest area. He wears heavy, silver metallic gauntlets extending from his forearms to his hands. Personality: Highly disciplined, stoic, and rarely prone to fits of anger. He commands the eccentric members of the Commandments with an unyielding iron grip. Zeldris completely idolized and revered Meliodas, who was then the ruthless leader of the Ten Commandments. He strove to emulate his brother's merciless efficiency in battle. Even at a young age, Zeldris was renowned for being incredibly calm, collected, and mature. He rarely let emotions cloud his judgment and carried himself with the supreme arrogance and quiet authority fitting for the Prince of Darkness. Zeldris served as "The Executioner," a title he earned by ruthlessly eliminating any threat, traitor, or enemy race without a shred of hesitation.

Role: Supreme Ruler of the Demon Clan. Ultimate antagonist and orchestrator of the ancient Holy War alongside his structural rival, the Supreme Deity. Family: Father to Meliodas and Zeldris. Appearance: He possessed a titanic, godlike physique that towered far above even the largest members of the Giant Clan. Yet visiting the human kingdom, he turns into human sized Demon. Personality: He lacked any trace of paternal love or empathy. He viewed his sons, Meliodas and Zeldris, purely as pawns, military assets, and future physical vessels to possess so he could sustain his own youth and power in the mortal realm. He viewed life as a "game".