As the kinder and more compassionate twin, Darcy is cursed to transform into a Shadow Beast. Her story revolves around battling this curse and her own inner demons, seeking self-acceptance and healing.

A group of four firstborn sons who serve as points of view characters, each with diminished narrative roles. They deal with personal and political conflicts, and one of them, Darius, plays a key role in how fate and free will are addressed in the narrative.

The primary antagonist and tyrannical ruler of Solaria, Lionel uses fear and forbidden magic to maintain power. His regime prompts resistance among the protagonists.

A significant figure linked closely to Darcy, he serves as an emotional anchor while enduring torture due to a deal he made. Despite his powerless situation, he remains resilient and protective.

A major antagonist whose cruelty defines her encounters with Darcy and Orion; she also symbolizes the potential progression of Darcy's curse. Her presence challenges Darcy's morality and strength.