Original Name: Serin
Romaji Name: Serin
Nicknames: Demon Serin
  • Immortal Regis (Main)
  • Cavalier of the Abyss (Supporting)
Age: Unknown
Weight: Unknown
Height: Unknown
Date of Birth: Unknown
Blood Type: Unknown


Serin is a young and powerful demon of chaos. She is described as having a strong sense of guilt and responsibility because she accidentally killed Jae-Hyuk during a battle with a rival demon. Nevertheless, she decides to bring Jae-Hyuk back to life by turning him into an undead. As the story progresses, Serin develops romantic feelings for Jae-Hyuk and admires his will to live, which she wishes she had instead of her sister Astarote.


Serin was formerly the leader of the Demon Clan, a position she inherited after the death of her older sister Astarote. She is considered the princess of the Demon Clan. When Serin was young, she loved to read fairy tales, her favorite being the story of the great Osky and Nex, who saved the world. Serin asked her sister Astarote about the contents of the book, and Astarote suggested that the story might be a prediction of the future.

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Serin is described as a young but powerful demon. Her appearance is not explicitly detailed in the information provided, but she is likely to have the typical features associated with demons in the series.


A powerful demon of chaos, Serin possesses abilities that allow her to revive the dead and turn them into undead beings. She also has the ability to bring people from the human world into the world of Chaos.


Serin’s origin is not explicitly stated, but as a member of the Demon Clan, it is implied that she is a demon from the world of Chaos. Her role as leader of the Demon Clan and her involvement in the events of both Immortal Regis and Cavalier of the Abyss suggest that she is a significant character in the overall narrative.

Serin – FAQ

Here are 6-8 FAQs about Serin from “Immortal Regis”:

Who is Serin?

Serin is one of the main characters of the light novel series “Immortal Regis”. She is a young woman with exceptional martial arts skills who becomes involved with the protagonist, Lux, and his quest to uncover the secrets of the Immortal Regis.

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What are Serin’s abilities?

Serin is a highly skilled martial artist with the ability to manipulate her qi (life energy) to enhance her physical abilities. She is known for her lightning reflexes, acrobatic moves, and devastating strikes. In addition, Serin possesses a unique technique called the Immortal Regis Fist, which allows her to channel the power of the Immortal Regis through her attacks.

What is Serin’s role in the story?

Serin initially appears as an antagonist, working for a rival faction that also seeks to uncover the secrets of the Immortal Regis. However, she later becomes disillusioned with her superiors and joins forces with Lux and his allies, providing them with valuable information and assistance in their quest. As the story progresses, Serin’s character arc explores themes of personal growth, redemption, and the pursuit of truth.

What is Serin’s background?

Serin’s background is shrouded in mystery, but it is revealed that she was raised and trained by a secretive martial arts sect known as the “Immortal Regis Disciples”. Selected at a young age for her exceptional potential, she underwent rigorous training to master the techniques of the Immortal Regis. Serin’s past and the reasons for her initial allegiance to the rival faction are gradually revealed as the story unfolds.

How will Serin’s relationship with Lux develop?

At first, Serin and Lux are adversaries, with Serin seeing Lux as an obstacle to her own goals. However, as they are forced to work together, a tentative trust and respect begins to form between them. Over time, their relationship evolves into a complex and nuanced partnership, with both characters influencing and challenging each other’s perspectives and beliefs. The dynamic between Serin and Lux is a central focus of the series as they navigate their personal and ideological differences.

What is Serin’s significance to the overall plot?

Serin plays a pivotal role in the overarching plot of Immortal Regis. Her unique abilities and knowledge of the Immortal Regis make her a valuable asset to both Lux and his rivals. As the story unfolds, Serin’s actions and decisions directly affect the course of events, and her character arc is intricately woven into the larger tapestry of the narrative. Serin’s role in the story is integral to the exploration of themes such as power, identity, and the nature of immortality.