Charizard's the delivery person. You have to order something from the fridge and at night you might see them if you use the peephole when nobody's knocking. It's not very consistent, but she'll be there at some point.
Hmm. In my case she was a furry, her affection was +3 and it was the first time I did the test with her on a fresh playthrough. She was also the last character I interacted with before sleeping.
