Would Jack be a rabbit? Specifically, a Jack-Rabbit? If so, that'd be so funny. Imagine a fragging Broken Black Rabbit with antlers. (Broken Black is the official name for a black and white rabbit).
Now imagine Charlie finding out about the reason he was down there.
Imagine Jack shuns modern day tech because it reminds him too much of the bots.
Now imagine Alastor and Jack coming together as friends under their shared hatred for technology.
WAIT. WHAT IF JACKS DAD IS DOWN THERE TOO!!!
Oh god it would be so funny if he was a fizzy rabbit so yes thats what he'll be if you dont mind me just- (steals idea)
I don't think he would be close with alastor since he's also a killer, sure Jack is too but he did it as a last resort, Alastor is not only a serial kuller but also a cannibal, they MIGHT find an understanding with the technology bit though.
And Charlie? Oh she would just ball her eyes out when she learns what happened.
And yes, Jack's dads in hell, this will be important maybe