カーラ

The Demon King. She has lived since the age of mythology from even before humans were born. She had rebuilt the demon tribe after they collapsed from the death of the evil gods, and is invading the earth as the Demon King of a new generation. 
Since she lives for so long, she believe humans are like insects and that demons should reign supreme in the world.
She is strict on herself and others, and despises incompetence. When she tried to summon the God of Destruction, she accidentally summoned the main character.