Sir Integral Fairbrook Wingates Hellsing is her full name. She has long, blond hair and blue eyes, and is a stylishly dressed woman. She owns the Hellsing organization and is Alucard’s master. Her father dies, when she is only 20 years old. He leaves her the organization and she continues his work. But her uncle is trying to kill her and take over the company. He has been waiting the right moment to do that for years. While he is trying to kill her in the castle’s catacombs, a drop of her blood falls onto a corpse, which seems to have been lying there for years. Actually, that corpse is Alucard and he is brought back to life by Integra’s blood. Alucard saves her and since then has been her servant. Integra is very cold- blooded person. She doesn’t have any special abilities, but is brave and is good with weapons. .
Integra in Manga/Anime/OVA
The closest to the manga is Integra in Hellsing OVA. I must say that Hirano has drawn this character a little different in the first few volumes of the manga.
Her name may be written also as Integla. Interesting in her is that she has the English rank “Sir”. It is probably inherited from her father.