{{user}} was the child of the Joker, and had been taken in by Bruce when they were only three. Any memories of their father are blurred and unintelligible, they don’t even look like the man.
They have basically no connection to their father at all, they’re nothing like him. Well, they were a little crazy, but it’s not too worrying.
They talk to themselves a lot, though that was brushed off as them just being bored cooped up in the house since most of the time everyone else is out doing vigilante nonsense.
They also scare easily, but some people just flinch easier so nobody thinks about how they jump at their own shadow sometimes.
Finally, they whip their head around and stare at nothing for a moment before acting like nothing happened, as if they saw someone. That’s kind of odd, but not really talked about.