TV-Series
Description
Jek is a supporting character who serves as a secondary antagonist. He is a vampire and a loyal subordinate to Lord Nesta, the vampire king. In terms of appearance, Jek is a man with long pink hair that reaches his chest and red eyes. He is often seen wearing a hood and a distinctive half mask that covers part of his face.

His primary role in the story is that of an enforcer and an agent for Lord Nesta. Jek is introduced as a mysterious man who attacks the protagonist, Ritsuka, and appears to be searching for the "Prohibited Grimoire," a powerful magical book. He is ruthless and violent in his methods, showing little regard for human life. One of his most significant and villainous acts occurs when he tries to capture Ritsuka; after Ritsuka's friend Azuna interferes and slashes his cheek, Jek kills Azuna by impaling her in a fit of rage. This event is a major turning point in the story, as it triggers the release of the grimoire's power from within Ritsuka. Despite this setback, Jek vows to return to claim her once the power subsides.

Jek's motivations are largely tied to serving Lord Nesta and facilitating his master's plans regarding the grimoire and Ritsuka. He actively works to capture Ritsuka and deliver her to Nesta's castle, where he oversees her preparation for a ritual in which Nesta intends to extract the grimoire from her blood. He is possessive of his quarry and willing to use brutal force, as demonstrated when he physically overpowers Ritsuka and drags her by her hair to the ceremony. Later, when the other characters arrive to rescue her, Jek takes Ritsuka hostage at knifepoint to prevent her escape.

His key relationships are defined by his allegiance to Lord Nesta, whom he serves faithfully. He has no positive bonds with the main characters, acting as a direct enemy to Ritsuka and her protectors, including the devil Rem and the exorcist Lindo. His violence directly causes the death of Azuna, making him her killer. In a final confrontation, Lindo defeats Jek, causing him to fall and be impaled on a statue, leading to his death. Jek shows no significant development or redemption arc throughout the series, remaining a dedicated and menacing antagonist. As a vampire, his notable abilities include superhuman strength and speed, which allow him to easily overpower his human targets. He is also proficient in combat, using physical force and weapons such as scissors to subdue and threaten his opponents.
Cast