i like the idea of Bad, at his first arrival being unemotional, taking souls despite not being their time yet because death is inevitable and you'll die anyway so why not just end it now?
so he'd be walking around the earth for centuries with that thought process until he'd meet someone, a child. who'd make him mourn and grief, making him realize just how precious life is. and how fragile it was..
he'd learn what mortal's call 'Empathy'. Becoming sympathetic to those he would accompany to the afterlife.
Then, he would meet Skeppy. Someone he would cherish, someone where he'd learn how to get accustomed to his own feelings, desires and dislikes. Though, not everything stays forever.
Loneliness was inevitable to beings like him, he'd come to terms with that.
but... he couldn't help but yearn for more. something.. similar.
same soul, different body.
Skeppy will come back, he can wait.
he can wait for years or centuries more. just have patience.
of course, skeppy isnt the only one in his undying life, he'd meet people from history books to people no one knew existed. he would accompany himself to them until his one special soul drops back down again.
so yerpp!! this is my idea of what Q!bbh's upbringing would look like (we love major character development!) the reason why i think that Bad would be unemotional at first is because no one would start out nice and stay that way for centuries, especially when you might've brought a MAJOR CATASTROPHE in your arrival.
also you can see how i kinda implied *some* obsession at the end... living for centuries and having front row seats at massive mortality rates can pull some screws loose y'know? it also explains the reason why he refers to skeppy as a being of 'multiple', because Bad actually might or might not have went out of his way to find reincarnated versions of the same person.
also!! the child, i like to think is a past life of sapnap (or whoever Bad "adopted" first)