A young-looking vampire that spends her time reading and listening to "Solveigs Song" by Grieg. She appears to live alone in a dark old house. Despite her young appearance, she is quite old and becomes something of a role-model for Seras. Helena is eaten by Incognito, though she continues to live for a short time afterward, even after being beheaded. (source: Wikipedia)
Tubalcain Alhambra is one of Millennium's artificial vampires, but much more powerful than Luke, Jan and the basic Millennium troops. His special ability is cards, using them to attack and regenerate. He was sent to assault the hotel in which Alucard and Seras were staying, and the coming battle with Alucard became his end.
Commander of the Hellsing organization's Paramilitary forces. He is an older human male with a deep voice and was Seras Victoria’s first tactical trainer after she became a vampire. (source: Wikipedia)
The older of the Valentine brothers, Luke is entirely unlike his brother, and sports a calm and composed behaviour. like Jan, he does not have any high class vampire abilities, and use a pair of sawed-off M1 Garand rifles as well as knives. Luke challenges Alucard, but grossly underestimate him, and is in the end eaten by Alucards Hellhound.
Leif aka Huger and his girlfriend Jessica were a couple of low level youngster vampires misguided into a belief that they can become immortal by killing off 13 random families on a road. They've managed to kill 4 before clashing with Hellsing operatives to our pair's great surprise. In Hellsing manga vampire boyfriend's name has never been mentioned so in different adaptations authors went with different versions: in Hellsing TV series he is called "Leif" multiple times while in Hellsing Ultimate character's name is never spoken out loud, yet noted as "Huger" in the end credits of episode one.
This masochistic vampire is from "the dark continent," a reference to Africa. Though physically androgynous, he is generally thought to be male. Extremely powerful, he combines dark magic with an enchanted ArmsCor 40 mm grenade launcher that fires spines. Incognito vomits into the launcher's cartridges before loading; and he also is known to have a gatling gun as backup. During the final plot arc of the series, he summons a snake-like being referred to as Set (presumably the Egyptian god of chaos) and takes it into his body in order to use its power to attack Alucard. Incognito has regenerative powers which seem to be related to the purple stripes and sigils covering his body. It has also been argued that, while Alucard may be inspired by - or is - Count Dracula, Incognito may have been inspired by the vampire Count Orlok, from the 1922 silent movie 'Nosferatu: The Vampyre'. Incognito does not appear in the manga and his name comes from the literal definition of the word, incognito. Alucard also states in episode nine that Incognito is an anagram. (Source: Wikipedia)
A foreign exchange college student who appears in Episode 3. He is actually the first artificial vampire shown implanted with the 'freak chip' as he attempts to turn another student Mick, with whom he was heavily implied to have been in a romantic relationship, into a vampire for the sake of "being together forever". After being apprehended and later placed in the morgue with the chip removed he is believed dead. This is later disproved when he comes back to "life" in search for Mick. Anderson was sent by the Iscariot Organization to destroy the foreign vampire but is rudely interrupted when Alucard is the one to kill him. (source: Wikipedia)