The main protagonist. Alucard is the most powerful warrior of the Hellsing organization. He is not only a vampire, but one of the most ancient ones. Alucard's original "life" dates back to the 1400s. Although his true identity is not explicitly stated, it is implied that he is Dracula, as it is his name spelled backwards.
Seras was a member of the D11 special forces unit until being mortally wounded by Alucard, in his attempt to destroy a vampire masquerading as a priest. On the verge of death, and with a large hole through her chest, she chose to allow Alucard to turn her into a vampire. Serving beneath Alucard, she now works for the Hellsing organization.
Integra is a 22-year-old noblewoman and the head and last member of the Hellsing family. Also, the strong and intelligent leader of the Hellsing organization, and Alucard's "Master". She inherited the Hellsing organization, at the young age of 13, when her father died. Although she often seems strict and domineering, she is respected and admired, even among her sworn enemies. Apparently an expert pistol shot.