Reborns who share their blood with other vampires (Shadow Falls)
As the one who sired the Master, Archaeus (Buffy the Vampire Slayer) possesses a direct link to the Master's bloodline, allowing him to influence those the Master has sired and any vampires they sire as well...
...as he demonstrates on Angel.
Abyss Watchers (Dark Souls III) partook in wolf blood, linking them to the Wolf Knight, Sir Artorias.
After using Harry Potter's blood in his resurrection, Lord Voldemort (Harry Potter) unwittingly took some of Lily Potter's Sacrificial Protection of Harry into himself as well, creating a blood link to Harry and tethering his life to his own.
As it bonded to him through his bloodstream, Cletus Kasady (Marvel Comics) shares a blood link with the Carnage symbiote, to the extent that he has been at risk of dying from anemia when separated from it, and can recreate it from his blood should it be destroyed.
By coming into contact with mutant blood, Predator X (Marvel Comics) develops a blood link to its prey, allowing it to see flashes of its prey's memories.
As he shares the same Shinso blood as Moka, Tsukune Aono (Rosario + Vampire) possesses a blood link to her, able to sense when she's in emotional distress.
As she shares the same Shinso blood as Tsukune, Moka Akashiya (Rosario + Vampire) possesses a blood link to him, able to sense when he's in emotional distress.
Crona (Soul Eater) is directly bonded to his demon weapon, Ragnarok, through the Black Blood.