Latia

Devilina is a demon from the eternal hell that has been resurrected by Carina's father with a contract of life protection for Carina, even tough Devilina never agreed with the contract at all. This has formed a wedge between both Carina, her brother Core.

History
Devilina was a human named Latia. She was one of the few woman greek warriors that protected the king as a vanguard patron. One day on titanomachy war, she witnessed her sister Geena being killed by the titans tragically. Unable to cope with the loss of her sister, she abandoned her position and fought against the titan, resulting in her own death along with the king due to losing both of his guards. As a result, she was cursed with the sin of abandoning her job as a patron, and her soul was thrown into hell, but her self identity as a guardian warrior still lived inside her devilish soul, and made her become one of strongest, hard-headed demons.