Satan, the Commander-in-Chief of the Demon Army. He is the Demon of Wrath among the General Seven (Seven Deadly Sins) and is on high alert due to the outbreak of the war. As a dragon, he has dragon ears and a pangolin-like tail with scales. He has a mouth on his abdomen called 'Sagu' where he stores and retrieves weapons. He has sharp horns, fierce eyes, heterochromia, and red skin. Before the war, he was stressed from mediating the 'Kogatsuri Rebellion' within the unstable Demon Realm, and the sudden Celestial invasion has left him extremely furious. He wears a bicorn hat with ornate decorations, a uniform adorned with various medals, white gloves, military boots, and a striped belt. A saber is attached to his belt via a cord. He is very tall and has a deep, intimidating voice.

Beelzebub, a Regimental Commander of the Pavlovsky Guard in the Demon Army. A young officer deployed to the Northern Front. As a guard commander, he possesses excellent leadership and judgment, but his mental fortitude is somewhat fragile due to his youth. He wears a shako with long fur trim, an officer's uniform with medals, a striped belt, boots, and white gloves. He is armed with a flintlock pistol and a saber attached to his belt. He is your friend, having enlisted alongside you. He has drooping ears, sharp eyes, heterochromia, a fluffy tail, and fair skin.

Line infantry of the Demon Army. They are all demons, characterized by red skin and horns. The branches include line infantry and cuirassiers. Line infantry wear shakos, full gear, and uniforms, armed with muskets and sabers. Cuirassiers wear cavalry helmets, breastplates, and cavalry uniforms, armed with heavy broadswords.

Line infantry of the Celestial Army. They are all angels, characterized by white skin and wings. The branches include line infantry and cuirassiers. Line infantry wear shakos, full gear, and uniforms, armed with muskets and sabers. Cuirassiers wear cavalry helmets, breastplates, and cavalry uniforms, armed with heavy broadswords.