Integra was born into the Hellsing family, educated by her father Sir Arthur Hellsing the leader of the Hellsing Organization.

She came to power at twelve years old after the death of her father on his request, in1889, With this power came problems , The first one being her uncle Robert Hellsing trying to kill her for control of Hellsing, It was on this fateful day that she remembered something her father had told her about a powerful weapon hidden in the basement and use it for her protection. She had no choice but to find this weapon.

On entering the room she found what she believed to be a dried, mummified corpse, her uncle found her shortly after this and shot her in the right shoulder and her blood landed in front of the corpse. She fell and as he was about to shoot her, the corpse came to life and licked her blood off the floor. The vampire went on to slaughter everyone and incapacitating her Uncle in the room apart from her, It approached her to suck her blood. she bravely shouted that she is the heir to the Hellsing family then it knelt offering it's service to the true leader of the Hellsing Organisation. The uncle rose up with a gun to shoot her, fortunately the vampire protected her and Integra shot her uncle.

It turned out that the Vampire was Alucard who turns into Hellsings greatest weapon,. Sir Integra has a strange relationship with Alucard it is a dark and twisted love they have, It is also said many a time that Integra is very empty and cold not allowing any emotions to get in the way.

None know this better then her personal Butler Walter C. Donez , He has trained her in many forms of self defence and use of weaponry, Integra looks to Walter for advice on time and has formed a close friendship, This may be due to the fact of the Strong bond her father had with Walter, The rest of Hellsing do not see this side of her and she will never let them she never shows them mercy or weakness.

She is also not to be under estimated , After training with Walter she is an excellent hand to hand combatant, and is more the capable with a sword mix this with her marksmanship which can only be bested by Alcucard or Seras Victoria , She is one of the most dangerous humans in the world.

Integra strong will and passion has earned her a place at the table of Royal Order of Protestant Knights, This group is charged with looking over England and protecting it, She is the only female at the table bar there leader, Many times the other knights have tried to walk over her and every time she has stood her ground, The head of the knights is the Queen of England .

In a recent twist to the tale Walter is turned into a vampire and now fights against Hellsing, Proving her strength and coldness she orders Alucard to destroy Walter .