Bellatrix Lestrange wasn't always twisted and evil. Once upon a time, she had been Bella Black. Big sister and protector of her little sisters: Andi and Cissy. An extraordinary witch with a bright future. A cheeky, moody teen who delighted in learning magic.
But, then she fell into the Black madness.
Pureblood supremacy.
The Dark Arts.
Sadism.
Each of these drew her in and slowly she fell. Her descent into madness was not wholly unexpected. She was the eldest, the favoured, the true Black.
So she strove further into the darkness. To maintain their status as Blacks.
Toujours Pur.