TV-Series
Description
Klen is the human disguise and alter ego of Clevatess, the Dark King of the South and one of the Four Lords of Dark Beasts. This specific human form is modeled after a deceased boy named Shiro Kletos, the son of a traveling merchant who died while protecting the baby Luna. Clevatess adopted this appearance after destroying the kingdom of Hiden.

As Klen, the character carries a demeanor of detachment and cold rationality, observing the human world with a mixture of skepticism and profound curiosity. This curiosity, sparked entirely by the human infant Luna, becomes the central driving force of his actions. He displays a clear duality, oscillating between moments of calculated wisdom and sudden, brutal violence inherent to his beastly nature. He is not driven by a desire for conquest but acts ruthlessly against any threat to himself, his lands, or those under his protection.

His primary role in the story shifts from a merciless destroyer to a reluctant guardian. After killing the thirteen heroes sent against him and decimating the human kingdom, he takes in an orphaned royal infant, fulfilling a dying boy's final wish. His overarching motivation becomes the observation and protection of this child, through whom he hopes to understand humanity. To aid in this task, he resurrects the fallen hero Alicia Glenfall, binding her to his service as an immortal caretaker.

Throughout the narrative, Klen undergoes significant development as he grapples with the conflict between his ancient, destructive instincts and his growing protective feelings for Luna. His engagement with the mundane challenges of childcare and his forced alliance with the hero he once killed compel him to question his own nature and the value of humanity.

In terms of abilities, Klen is the human vessel for the demon king's immense power, though he is notably weaker in this form compared to his true monstrous shape. He has absolute command over light and darkness, the power to transform and move between shadows, and the ability to resurrect the dead. Even while limited to his human guise, his strategic intelligence and immense physical and magical strength make him a formidable opponent, capable of defeating heroes armed with sacred weapons.