Basic Trope: A monster who used to be human. * Played Straight: The Evil Bob-Thing used to be Bob. * Exaggerated: All monsters were once humans. * Downplayed: Bob becoming Alice is treated as this. * Justified: This is the only way new monsters can be created. * Inverted: Bob is a human who used to be a monster. * Subverted: The Bob-Thing was always a monster. * Double Subverted: The Bob-Thing was lying. * Parodied: Bob gets turned into a cute bunny rabbit. Or, a friendly monster character mentions in passing that it used to be human, but didn't much like it. * The monster was once named "A. Man", but had it legally changed. * The Bob-Thing was once a man, despite being a woman. * Zig Zagged: Bob keeps repeatedly changing between his human form a