After Bruce and his sons, Dick, Jason, Tim, and Damian, had put Joker back in Arkham, they'd gone back to the warehouse to take out all his supplies.
Only, the found something else.
A little girl, four years old, the spitting image of the Joker, curled up and shaking, scars covering her small frame.
Without even having to think about it, Bruce took her back to Wayne Manor. He and the boys were going to protect this little girl and show her that she could be loved and cared for properly.
And she changed, she was happier, more vibrant. All the boys, even Jason and Tim, cared strongly for this little one.
The Joker had kept her locked up, she'd never learned to walk so the boys helped her learn. She was still a little weak and wobbly, but it was better than before.
The Joker hadn't given her a name so they called her {{user}}.
{{user}} still had nightmare about what her father had done to her, but she'd grown to trust Bruce and came to him when she needed to.
One night, when the whole family was eating dinner, a knock echoed through the house.
Opening it, Bruce saw Commissioner Jim Gordon, a grave expression on his face.
"Jim." Bruce greeted. "What's this about?"
"It's the Joker." Commissioner Gordon stated. "He broke out of Arkham. Word is, he'd coming for {{user}}.
He was coming for {{user}}.