Isis Frederick/Relationships

Oscar Frederick:
Oscar is portrayed as being highly obedient towards and even afraid of his sister, revealing her to be much more influential than him in spite of his status as the family heir. Isis, in turn, appears to view him as rather naive and foolish, dismissing his wishes (such as wanting to get engaged to Aria rather than Mielle) under the pretext of him not being mature enough to know what is good for him and the Frederick family as a whole. Nevertheless, Isis appears to sincerely care for her little brother, as shown by her smiling brightly directly ahead of her execution after finding out he will walk out of the affair without any punishment.

Allies
Isis holds little or no regard for many of her allies, instead manipulating them in whatever possible to elevate her status.

Mielle Roscente:
In the original line of events, Mielle and Isis were important allies. Isis was happy to support Mielle, figuring that connecting the duchy to the wealthiest family in the country would be beneficial to her family. Mielle, on the other hand, was madly in love with Oscar and saw the opportunity to raise her status and become the second most influential noble lady in the Empire after Isis herself as Duchess Frederick, leading her to be immensely loyal to Isis and perfectly play the role of her pawn. In the revised timeline, however, Mielle and Isis grow increasingly distrustful of each other; after Mielle’s failed attempt to frame Aria as the murderer of Count Roscente and the subsequent decline of her reputation, Isis attempts to toss Mielle aside, which Mielle responds to by threatening to publicize letters outlining the Fredericks’ plan to overthrow the Imperial family. The two of them enter a reluctant alliance as Isis prepares to marry King Lohan Croa, with Isis ridiculing Mielle for her talk about the Crown Prince’s special ability and Mielle using the first available opportunity to consolidate her standing independently of Isis. By the time they are in prison together, their relationship has become openly antagonistic.

Asterope Franz:
Isis does not think highly of the Crown Prince, viewing him as a mere tool to achieve her goals. Although cordial and respectful in formal exchanges with each other, this side of their relationship is shown to be a façade; the two of them, being the leaders of their respective fractions, have, in reality, been scheming against each other on a political level for years. She considers him to be beneath her and is noticeably surprised upon hearing of Asher’s wise decision to sell off the casino, suggesting that she does not think of him as being particularly intelligent either. Whilst originally quite wary of and respectful towards Isis as the mastermind of the Aristocratic Fraction, after gaining the upper hand, Asher seems quite dismissive of Isis as well, openly calling her delusional and feeling disappointed in himself for falling for her plans in the first place.

Aria Roscente:
Isis is quite resentful of Aria, losing her composure for the first time in the series in relation to her and even fainting upon hearing about Aria’s relationship with Asher. Count Roscente’s plans to marry Carin Roscente are shown to have upset Isis, asking Mielle and Cain to prevent their marriage but ultimately failing. Initially merely viewing Aria unfavorably due to her origins at the bottom of the social hierarchy, Isis grows more and more distasteful towards her after hearing of Aria’s success, calling her achievements into question and asserting that their (referring to prostitutes in general) whole breed are supposedly parasites with only a talent for seducing men. Aria’s view of Isis, on the other hand, is only given sparse information on; when Isis begins playing a major role in the story, Aria seems to be quite afraid of her, even thinking that all her efforts to ruin Mielle might have been futile because of Isis’ status as Mielle’s benefactor. After gaining power and influence, however, Isis doesn’t seem to occupy much of Aria’s mind with her attention being directed instead towards her goal of destroying the reputation of her stepsister.