Hunters are humans who hunt down the supernatural and save people from monsters and other creatures. The series is about two brothers who are hunters - Sam and Dean Winchester -, that fight against demons, vampires and much more.
The Vampire Diaries
As of right now there are only Vampire Hunters known on the show, But the Vampires "Hunt" down the werewolfs as their bite kills vampires.
* Vervain - When ingested, vervain causes a vampire to become severely weak and feverish. Also, If a vampire's skin is exposed to vervain, it can result in burning them.
* Wood - If a vampire is wounded by wood it will cause the vampire to become severely weak and if a vampire takes a wooden stake through its heart it will result in death.
* Fire or Sunlight - Any exposure to fire or sunlight will result in death to a vampire.
* Heart Extraction - The act of removing a vampire's heart will result in death.
The Secret Circle
A witch-hunter is a mortal-being apart of an ancient religious society, whom seek to discover, expose, and ultimately kill all witches within the world.
The True-Believers are a group of dedicated witch-hunters, whom have recently come to Chance Harbor, Washington to destroy The Secret Circle. Unlike most witch-hunters, the True-Believers have recently recruited a witch to infiltrate covens, and also to cast spells that can weaken the power of other witches.
Buffy the Vampire Slayer
Slayers were young female humans bestowed with mystical powers that originate from the heart of a demon, which gave her superhuman senses, strength, speed, endurance, agility, and healing in the fight against forces of evil.
While known primarily as the "Vampire Slayer," the Slayer also acted as a hunter of evil mystical forces in general (demons, bad witches, etc.). She also received occasional prophetic dreams during her sleep.
The Walking Dead
Dhampirs: half human and half vampire. Since Moroi are the only ones with whom Dhampirs can reproduce, they have to stay close to them. It is in their interest that the Moroi survive. That's how the guardian system started.
Most of the Dhampir men and few Dhampir women train to become guardians. After their graduation they stay with a Moroi who they have to protect from the Strigoi.
Dhampirs have no magical gifts, but they are very strong and can turn into great warriors. Thier reflexes and senses are the same as vampires with strength and endurance from humans. Their strength surpasses both humans and Moroi. They heal faster then humans do. They feed the same way as humans do and have no problems being out in the sun. Their looks are human, too though they are described as being more attractive then humans. They are not as powerful as the Strigoi so they have to train very hard to increase their strength, speed and stamina.