Giselle Fautus
The granddaughter of the noble Fautus family.
A person who have a great connection with Mephistopheles (has a few related to her family due to the family's business through the marriage).
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Grown with all envy and wrath since she was treated with ignore by demons, except her family, but want to take a revenge for her imperfect childhoods.
She also hate Luciana and Roslyn because their popularity and beauty further than hers.
About Roslyn, Giselle strongly hatred her, as for reason her crush Diablo was married to Roslyn and heard the news they have childrens. That's make her feel more uncomfortable and revengeful.
Giselle used to be the leader and co-founder of the Newspaper Club but was over by Diablo's order as she thinks the reason is come from Roslyn, who's uncomfortable for the news of gossips.
After graduating, she organized a secret league called "Anti-Roslyn League" but for those who have a common with her to join in. Inside of the room, she prepare kinds of potions and antidotes for the planning to kill Roslyn and get the crown of the Demon Queen someday.
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Later, one day, Giselle was invited by Diablo and Roslyn to their triplet childrens' birthday. She knows it is a best chance to complete her desire.
In the palace, while all the noblities were chatting, she sneaked and dropped a dip of poison in Roslyn's wine glass.
However, despite the plan almost succeeded, it had discovered by the palace maid, Daphne.
Giselle was eventually imprisoned in the mansion, and although ordered to remain behind bars, her brothers begged Diavolo for mercy. Additionally, she lost the wealth and luxury she had earned as a result of her crime.