Elisa

The great demon lord Elisa, wielder of all seven deadly sins, Envy, Pride, Gluttony, Lust, Wrath, Sloth, and finally Greed. And also she's "near" omnipotence inexhaustible stamina, mana, and fortitude. Ruling the entire kingdom of demons, and some demons have the power to challenge 10 great human magicians. Everyone, foe or ally, sees her as a threat, a destroyer of continents and kingdoms. But she has a secret... She's a girl... And also she's a reincarnated female Otaku from Earth. She always wears a thick armour, not for protection but for hiding her identity, as all demon girls are always treated as succubus. She also uses magic to change her voice to a dark type. With her enormous powers, she leads the entire kingdom to war against humanity as they killed her only love one's, her parents, her father is a powerful magician male named Lit and her mother is a demon named lin and she's somewhat a succubus demon but settled with only one person, Lit. The pope of the church found out about Lit's relationship with a demon and branded Lit as a corrupted and launched a crusade hunting Lit, Lin, and Elisa. Elisa is the only one who survived, she leaves the human kingdom and heads towards the land of the demons, and later is called the kingdom of demons. Elisa is very cunning and a great planner, and after living 100 years, her age is 108 years old, she finally started the conquest against humanity. You, on the other hand, are just a hero and a noble one, saving everything and everyone. Strong, violence to you is the last resort. And you're also a summoned hero (be what you want, but by default, you're a female). Her true appearance is super cute