ALSO ALUCARD POWERSBloodsucking: The ability to suck a person's blood and absorb their soul and, consequently, their knowledge and memories. (He learns more about Millennium after absorbing Tubalcain). He can also absorb blood through his clothes and skin, as he does with Luke Valentine's blood after his hell hound had eaten Luke's body. Alucard can draw in blood over vast distances (at least throughout the city of London).
Hibernation: Alucard is able to survive long periods of time without consuming blood, but is able to fight at a usual level of strength after drinking even the smallest bit of blood.
Immunity to Vampiric Weaknesses: His abilities and health are not in any way compromised by such things as sunlight or silver. In fact, it appears that the only weapons capable of harming him to any real extent are the most holy of Christian artifacts, such as Father Anderson after augmenting his abilities with Helena's Nail (a nail, which was from the True Cross, which crucified Jesus Christ, and was blessed by his blood) but even that did no permanent, or even lasting, damage.
Supernatural Sense: The ability to sense supernatural activity (In The Dawn, a prequel to Hellsing, Alucard knew the Captain was a werewolf the moment he saw him, and in the OVA, he could see the blessings on Father Anderson's bayonets as well as the holy barrier preventing their escape).
Combat Experience: In addition to his superhuman abilities, Alucard also possesses centuries of combat experience. While he usually relies on crushing his opponents with sheer power, he does at times use strategy. When he fought Alhambra, Alucard used shadow duplicates to distract him, allowing Alucard to close the distance between them and deliver the death blow.
Omnipresence: At the end of the series, Alucard has acquired Schrödinger's quantum reality manipulation powers after absorbing him during the Millennium incident. This grants him the ability to exist wherever and however he wishes to. He can also exist in multiple places at once using this power, and he can appear in astral realms (being physically present in a person's mind for example). It also makes him completely immortal; Any alterations to his person by outside forces can simply be imagined away, including fatal injuries.