Curate, connect, and discover
I think William made the funtimes for his family. Like baby is an obvious, we are literally told that she was made for Elizabeth. We are given quite a few hints that Ballora was made for Miss Afton, biggest one being the table in security breach. Michael obviously loves foxy. And my big one is that Funtime Freddy was made for Crying child, with the fredbear plush he had AND that he also had a Freddy plush on his bed in game 4 I'm thinking his favourite was Freddy/Fredbear. It would also make sense that Funtime Freddy has something like BonBon to calm him down, because we see Crying child having an emotional attachment to his plush.