OVA
Description
Dimitrie Vatler is a character who appears as a Duke of the Ardeal principality, a domain within the vast empire ruled by the First Primogenitor, also known as the Lost Warlord. He is a pure-blooded vampire and a direct descendant of the First Primogenitor, and his official position on the man-made island of Itogami is that of an ambassador representing the Warlord's Empire.

In terms of his background, Vatler possesses an unusually high level of power for a vampire who is not a Primogenitor. He has achieved this formidable strength by having consumed two elder-class vampires in the past, a feat that has brought his own power to a level that is considered to be very close to that of a true ancestor, or Primogenitor. This act has made him an exceptionally dangerous and influential figure within the vampire society, earning him the title of Snake Charmer or Snake Handler, which refers to his unique abilities.

Regarding his personality, Vatler is best described as a hedonist who is perpetually driven by a profound sense of ennui. His primary motivation is the pursuit of entertainment, which he almost exclusively finds in the thrill of combat against overwhelmingly powerful opponents. He is a battle maniac who delights in pitting his strength against formidable foes, often regardless of the consequences or the morality of his actions. His moral compass is ambiguous at best, and his deeds are typically not born from a sense of justice or duty, but rather from his own amusement and a desperate need to alleviate his eternal boredom. Despite this seemingly chaotic nature, he is also shrewd and intelligent, carefully managing his actions to ensure he does not jeopardize his privileged position on Itogami Island, demonstrating a calculated side to his eccentricity.

His role in the story is largely that of a wild card and a provocateur, frequently interacting with the protagonist, Kojou Akatsuki. Vatler was originally infatuated with the previous Fourth Primogenitor, Avrora Florestina, and after her death, his obsessive interest transferred to Kojou, who inherited her blood and power. He is deeply fascinated by Kojou’s potential as the new Fourth Primogenitor and consistently seeks to test his abilities, sometimes as an antagonist and other times as a temporary and unpredictable ally. He is not a traditional villain, as his goals are self-serving and his allegiances shift based on whatever promises the most engaging spectacle. For instance, he has coordinated with other powerful figures when their interests align, and he has a well-documented goal of preparing for a decisive confrontation with a being known as The One (Kaleido Blood).

His key relationships are defined by his obsession with power. He playfully refers to Kojou’s Sword Shaman, Yukina Himeragi, as his love rival, framing their interest in Kojou as a form of competition. He maintains a formal but often tense relationship with La Folia Rihavein, a princess from another nation, due to their high political stations, though they have been known to cooperate for mutual benefit. He is also known to keep a retinue of female attendants who are predominantly exiled princesses and noble daughters from conquered or subjugated territories, whom he treats as honored guests rather than servants, as he reportedly has no romantic interest in women. His close companions are often beautiful young men, such as his two bodyguards, who are also vampire nobles.

One notable area of development for Vatler is his evolving role from a simple combat-obsessed noble to a character who becomes more directly involved in the overarching narrative. While his primary motivation remains the pursuit of battle, his actions contribute significantly to key events, such as orchestrating incidents to lure out powerful entities or assisting the main characters when a greater threat emerges that could provide him with the challenge he craves. He is instrumental in several major arcs, including those involving the salvation of certain characters and the final confrontations with antagonistic forces.

In terms of notable abilities, Dimitrie Vatler is a master of Beast Vassal summoning, commanding a total of nine distinct familiars, which are all serpentine in form. These familiars are named after the eight dragon kings from Buddhist mythology, such as Sagara, a massive serpent that can control water and generate immense pressure, and other named familiars like Manasvin, Utpalaka, Upananda, and Vasuki. His unique power, which gives him his nickname, is the ability to fuse these serpentine familiars together to create entirely new and vastly more powerful creatures, such as Shakara, a fusion of his first and second familiars. This ability to combine his forces grants him an extraordinary level of tactical versatility and raw power that can rival the familiars of a true Primogenitor. Beyond his familiar summoning, he also possesses the standard superhuman physical attributes of a powerful vampire, including immense strength, speed, and durability, and has even demonstrated the ability to partially transform himself into a serpent-like form.
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