Roselia

Roselia Ishtaris (ロゼリア・イシュタリス, Rozeria Ishutarisu) is a pivotal supporting character of Seiken Gakuin no Makentsukai. She is the girl known as the Maiden of Rebellion, who saved Leonis Death Magnus when he nearly died from human's betrayal and turned him into a Dark Lord. She is the sole reason for Leonis' decision to rebuild the devil army after hibernating a thousand years.

Appearance
From Leonis' view, Roselia is a beautiful woman with long purple hair and golden eyes.

Background
The origin of Roselia is vague, but at sometime, she is called the Maiden of Rebellion. She met Leonis when he was about to die after being betrayed and executing by human. She resurrected the boy once called a hero, changing him into a Dark Lord. She saved Leonis when he’d lost faith in this world, and then she went on to try to save the world itself.

Sometime later, when Leonis became very strong, she gave Leonis a Demon Sword named Dáinsleif; he only could use it to protect his "kingdom", and he accepted it. The time she spent with Leonis came to an end when she suddenly felt ill. Before saying farewell to Leonis, she told him to look for her after a thousand years and try to continue saving the world himself.