There's probably nothing ominous about that last line. Have a look at the Poppy's Playtime Chapter 4 trailer below, where you can take a look at Doey for yourself and decide if he's really triple ...

but we may have a solid clue about who the villain is in Poppy Playtime Chapter 4. Chapter 3 ended with the death of CatNap, the main antagonist who worshiped the mysterious Prototype. Now ...