Cro was part of the containment team Grand Bell sent during the IPD outbreak in the Slums. _{[Okay the Slums are full of IPDs so it's not like it's the only outbreak ever but details....]} He saw me standing alone in a burning field and asked if I was hungry... and then he eventually invited me to live with him!

_{[hmmhmmm....]}

Cro lost his parents in an IPD outbreak when he was a kid, too, actually. Miss Luca's family took him in.