I can only imagine I would bond instantly with Toriel:

“So miss Toriel, what kind of mother are you?”
“Well, I tried to roast Frisk with fireballs the first time I met them. I also lost my son. And my adoptive child. And then I let the six next childs walk to their death outside the ruin. You?”
“I abducted Steven into a spaceship that almost blowed up with him inside once. I also didn’t helped him when he was hanging out from a bottomless cliff.”
“Parenthing is hard.”
“Tell me about it.”

"Their fandom might not be as bad as ours, but it's getting there."