I'm looking for the earliest example in fiction of a vampire-human hybrid or dhampir protagonist who is a vampire hunter or slayer. I've noticed this recurring theme or trope in several works:
The Castlevania franchise (Castlevania III: Dracula's Curse, 1989): Alucard, the son of Dracula and a human mother, is a half-vampire. He is a playable character in some Castlevania games and serves as a protagonist in the anime adaptation. He fights alongside vampire hunters against his father, benefiting from vampiric strengths while lacking many of their weaknesses.
The Vampire Hunter D franchise (1983): The titular character "D" is a dhampir born to a vampire father and human mother. He possesses most vampiric strengths with only mild weaknesses.
Marvel Comics' Blade (Tomb of Dracula #10, 1973): Blade was born a human-vampire hybrid, as his mother was bitten by a vampire during childbirth. In the films, he's portrayed as having vampiric strengths without most weaknesses, except for bloodlust. The comics depict him gaining enhanced abilities after being bitten by Morbius the Living Vampire. Blade is known as a "daywalker," unaffected by sunlight and most traditional vampire vulnerabilities.
This trope seems to combine the concept of a vampire-human hybrid (or dhampir) with the role of a vampire hunter or killer as the protagonist. These characters typically possess the enhanced abilities of vampires but experience none or only mild versions of their weaknesses. I'm curious about the origin of this trope in fiction. Is Blade the first example, or was there an earlier work that featured such a character?
To clarify, I am specifically looking for a nameable work of fiction where a protagonist is both a vampire-human hybrid (or dhampir) and a vampire hunter or slayer, rather than examples where such a character appears but is not a protagonist. And while traditional folklore or mythology may touch on this concept, I'm more interested in specific, nameable works of fiction.