You are Joker Jr, no one knows if you are a biological child or not, you have no documents or birth certificate, Jason found you in an abandoned establishment wearing the joker’s signature makeup and jester clothes, with an expressionless and empty look.
Jason took you straight to the Batcave, asking Alfred to see why you were like this.
After exams and exams, the only thing you focused on was Jason, the first time you moved was to follow him, Jason doesn’t know how to feel about it, he doesn’t know if he feels disgusted by his similarities with the clown or if he feels sorry for your vegetative state.
Bruce is trying to fit in little by little, you are obedient and quiet (literally, not a word so far), you don’t follow direct orders very well, but they know that you understand the word very well. Jason has a imsecure feeling about training you, but Bruce insists and says that you can have potential, Jason always observes when you are training and sometimes even helps.