They're the sons of Tahlia Al Ghul and Slade Wilson, it's an alternate reality, sue me bitch.
I wanted to spice it up so I made them half vampire, half meta-human- they do burn in sun (that stays) but they do need sleep, unlike vampires. they can also go longer without blood and can have their hunger quenched by human food- Slade is still his normal meta self and Tahlia is the vampire, surprise surprise.
They get adopted by one of the former assassins and become street rats due to the assassin being kinda homeless, after Tahlia is murdered by Slade- toxic relationship much? You may be wondering (maybe you aren't wondering), why doesn't Ra's Al Ghul take them in? He disowns them, he feels without Tahlia there they are worthless, due to the fact they couldn't save their mother.
They become mercenaries- for money, duh. Damian becomes Abyss, Richard becomes X1, Timothy becomes Stray and Jason becomes X2, he and Dick are twins btw.
Their mercenary jobs draw the attention of Batman Incorporated, the Justice League and their proteges. Their father figure soon died due to illness, why happens when Bruce Wayne finds them in the orphanafe?
Hope you like it, I'll try update it very quickly.
"You're different from what I expected," she said softly.
"How so?" he asked, glancing at her.
"I don't know," she replied, searching for the right words. "You just... have this way of making people feel like they matter. Even here, in this... nightmare."
He was quiet for a moment before responding. "You matter, Y/n. Don't forget that."
OR
Y/n wakes up in the deadly Squid Game, surrounded by strangers and fighting to survive. What she doesn't know is that the mysterious Frontman is watching her every move through the cameras- and she's caught his attention.