Alucard (or "Dracula" spelled backwards) is the long lost son of the Count. He is half human, half vampire, as his mother was a mortal. Although he served his father, he was soon convinced that spreading his father's evil was wrong, and joined Trevor Belmont in his fight. In Castlevania 3, he uses a Ball of Destruction as his main weapon, but he can't use any other special weapons. Alucard can take as many hits as Trevor. Since Alucard is a vampire, his main power is the ability to turn into a bat and fly around until the hearts run out (turning into a bat consumes heart at the rate of roughly 2 per second) or when he gets hit by an enemy.

Alucard is also known as Adrian Fahrenheit Tepes. After helping Trevor destroy his father, Alucard put himself to sleep in order to put his cursed bloodlines. However, he is awakened once again to discover why Richter Belmont has disappeared in Symphony of the Night. In Symphony, Alucard's primary weapons are a selection of swords and shields, as well as a number of magic spells.

O yeah, there's a famous character using Alucard as his name too... from the Hellsing Anime, I've watch the anime, but on my point of view, alucard basically name of a half vampire that do not want to be a vampire.. Hehehe... Well, any information I gave wrong? please update me... Hehehe..