TV-Series
Description
Isaac Ray Pelham Westcott is the managing director and de facto founder of DEM Industries, a powerful company that serves as his primary instrument for achieving his goals. He is a tall man with dark ash blond hair, sharp eyes that have been described as lifeless like rusted metal or dull blue, and extremely pale skin. While he appears to be in his early thirties, his actual age is approximately fifty years old, though he maintains a youthful appearance. He is always seen wearing a formal black suit, projecting an image of a refined gentleman.

Westcott possesses a deeply abnormal and sadistic personality that he learned to conceal during his childhood. From a young age, he experienced a morbid fascination with death and derived genuine pleasure from witnessing the suffering of others. He first recognized this inclination when he felt joy rather than sorrow upon the death of his pet dog, and again when he found delight in the mournful faces at his own mother's funeral. Understanding that such feelings would lead to his isolation, he resolved to hide these tendencies behind a mask of civility. After his hometown was destroyed and his fellow Magus villagers slaughtered, this social restraint vanished, and he felt liberated to pursue his desires without pretense. He expressed gratitude to the perpetrators for giving him the perfect justification to act on his innate impulses. Westcott is also masochistic to a degree, finding pleasure in his own suffering and expressing curiosity about the experience of death itself, placing little value on self-preservation.

His primary motivation is the complete obliteration of the current human race. As a child, he was a Magus, a pure wizard, living in a village with his childhood friends Ellen Mila Makers, Elliot Baldwin Woodman, and Karen Nora Makers. When outsiders attacked and slaughtered their village, Westcott was profoundly affected but not in the way one might expect. He and the other survivors became disgusted with humanity and decided to eliminate all humans to remake the Earth for themselves. To achieve this, they used an inheritance Westcott received after being adopted by a wealthy elderly couple to establish DEM Industries and research methods of human annihilation. They created a ritual called spirit magic to gather the world's mana and birth the first Spirit. However, when Elliot fell in love with this first Spirit and abandoned their revenge to form Ratatoskr, an organization to protect Spirits, Westcott broke with him and continued his plan with Ellen by his side.

In the story, Westcott serves as the main antagonist and final boss. He is responsible for minimizing Tobiichi Origami's punishment after her rampage, not out of kindness but because he recognized her potential as a Wizard. He becomes obsessed with harnessing the power of Spirits in their Inverse Form, forcibly extracting their Qlipha Crystals. He orchestrates the torment of Spirits to induce their inversion, as seen when he captured Tohka Yatogami and discussed various forms of torture to break her spirit. He also manipulated Nia Honjo, planting a Realizer in her head to suppress memories of torture and releasing it at the critical moment to cause her inversion. Throughout the story, he remains calm and composed even when his own life is in danger, confident in his schemes and the protection of his powerful subordinates.

Key relationships define his role. His closest ally is Ellen Mila Makers, the world's strongest Wizard, who serves as his secretary and constant bodyguard, calling him by the nickname Ike. Elliot Woodman, a fellow survivor of their village's destruction, became his sworn enemy after founding Ratatoskr to protect Spirits, though Westcott still asks him to return to DEM as if viewing his betrayal as a childish tantrum. He develops an interest in Shido Itsuka upon discovering Shido's ability to seal Spirit powers, seeing him as a hindrance to his plans. Interestingly, he briefly calls Shido by the surname Takamiya, revealing knowledge of Shido's past and connection to the first Spirit, Mio Takamiya. He views all other people, including his own loyal subordinates, as disposable tools for his ambitions.

Over the course of the narrative, Westcott evolves from a calculating schemer without personal powers into a devastatingly powerful being. Initially relying entirely on Ellen and other Wizards to execute his plans, he eventually succeeds in extracting a Qlipha Crystal from Nia Honjo, gaining the incomplete Demon King Beelzebub. This power takes the form of a book that can transfer any information its user seeks directly into their mind, share that information through touch, summon shadow creatures to fight, and trap targets in an alternate world called Ashufiriya where they assume roles from fairy tales. Using Beelzebub, he learns that Shido changed history through Kurumi Tokisaki's time manipulation. Later, he recreates the ritual that birthed the first Spirit upon himself, becoming the second Spirit of Origin and gaining three additional Demon Kings with power rivaling Mio Takamiya herself. Even with these immense abilities, his preferred fighting style remains one of support, empowering his subordinates like Ellen to fight for him rather than engaging directly in combat.

Westcott possesses several notable abilities beyond his Demon Kings. He is one of the few remaining pure Magus, or wizards, giving him innate magical capabilities. He was instrumental in creating the Realizer device and the CR-Unit armors used by Wizards. His mind is exceptionally sharp, allowing him to build a global power from nothing as a child and orchestrate complex schemes that unfold over decades. He can accept Qlipha Crystals that would normally drive their hosts berserk with no adverse effects, though he acknowledges limits to how many he can safely absorb at once. After becoming a Spirit of Origin, he gains immense durability capable of withstanding attacks from multiple sealed Spirits, can empower others with his power, and wields Demon Kings representing a flower, a tree, and a seed that serve as evil counterparts to Mio Takamiya's Angels. Despite all this, his powers have weaknesses, including a connection to Nia Honjo's Angel Rasiel that she can exploit to interfere with his information network.