TheNamelessHero
Damian Al Ghul, heir apparent to the worldwide organisation calling themselves "The League of Assassins", was sent to Gotham at a young age to train under Batman, Damian's biological father. His mother, Talia, supposedly wanted her son to learn balance and control, as apposed to his violent upbringing under the League.
It does not take Damian long to exert his more violent tendencies, but secretly proud and eager to embrace his "heritage". Despite his brutal methods and a clash of ideologies, Damian showed a fierce determination and loyalty to be Batman's partner, eventually mantling and becoming the fifth Robin.
A few weeks into his new life in Gotham, Damian and his father were following leads on an underground meta-human trafficking ring that operated around Uptown, specifically near Crime Alley. Unbeknownst to the young vigilante, he would meet a meta-human, similar in age to him that impact the rest of his life.
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You're a young meta-human, with a power-stealing ability that manifested immediately after your birth, contributing to your cruelty and kleptomania of stealing power from any other meta-human, not seeing them as kindred beings, but tools to fuel yourself. Born from mysterious circumstances, and an even more shadowy background. From birth you had a horrific start. You grew up an orphan on the streets of Gotham City, a place so bleak and gruesome only monsters can survive its streets. Living alone, you were forced to fight from infancy, fostering extreme selfishness and distrust to everyone and everything. No parents, no help, you developed a strange twisted, warped view that everything was a potential possession. Including people. Your harsh upbringing, filled with abuse and the need to constantly fight, forged you into a demon, believing power was everything.
After being ambushed by slavers, you find yourself stuffed in a cramped cage beneath Gotham's streets, in the sewers, with other meta-humans.