Daddy Long Legs would be an interesting, but pretty cool idea for a main antagonist for chapter 5. I believe chapter 5 could be a remix chapter, featuring core mechanics from the previous chapters, such as a vent chase with Huggy, or a game of laser tag with Daddy, but instead of a laser, it is a gun. I would think he would be introduced the same as Mommy, in a long dark hallway, but instead of destroying one hand, he destroys the whole grab-pack. He would also be wearing a life support system with a tank filled with poppy gas, since he hasn't been fed in years.

I believe a new hand is in order for this chapter, and it should have to do with the lab. I believe the new hand should be the Sample Hand, it is shaped the flair hand, but its blue. It has a hole at the tip of the pointer finger, allowing to store 1 test tube, which can be used for puzzles. After Daddy destroys your grab-pack, you need a new one. Which is why you are gonna get the Lab-Pack, a variant of the Grab-Pack that only has one hand, but a bunch of storage space, meaning that you are going to have to swap your hands a lot in this chapter.

I believe Huggy Wuggy should fully be introduced similar to in chapter 1, after opening a gate. This will begin a chase sequence throughout hallways and vents, but you eventually use your Lab-Pack to slam a gate on his head. However, Daddy grabs the gate, holding it, and Huggy picking you up, and shoving you into Daddies face. Daddy will give another monologue, then he will order Huggy to toss you into the vent. He will then chuck you into the vent next to you, sending you deeper into the laboratory.

I believe when you and DLL have your final boss fight, it ends almost exactly the same as Mommy Long Legs, with him ending up in a grinder. This does happen, but then, you see his head begin to crack, and the prototypes hand begins to slowly crawl out of Daddies mouth. But instead of the Prototype, it is a spider looking machine, with the hand that clawed its way out being on top of the spider.

I believe the chapter should end on one final cliff-hanger, with the final chapter being chapter 6. It will end shortly after the DLL final fight, with the Prototype telling you on a radio about the spider. It is known as the The Messenger, and there are thousands of them the Prototype sent to the higher floors to clear out any remaining parts of the monsters. He even reveals that the hand in chapter 2 that carried away Mommy is a messenger, along with the one that carried away Catnap, and there were ones that dragged away Huggy down here, and one that even took the residue from Doughy. You then enter an elevator, but not before being chased off by a hoard of Messengers. When you enter the elevator, you go down slowly, until the wall crumbles away in front of you, revealing a massive room, hundreds of kilometers in diameter, with the carcasses of dead monsters as far a the eye can see. The elevator will then stop working, and the Prototype will begin to chuckle. You then see the toys dissolving away, showing tens of thousands of Messengers, all crawling across the forgotten toys.

I believe the title of chapter 5 should be Redux, since redux means to bring back to life, and multiple antagonists have been pretty much brought back, with DLL acting as the stand-in for MLL, and the full revival of Huggy, and multiple reveals at the end of seemingly all of the previous antagonists coming back in the next chapter with the reveal of The Messengers.

I hope you enjoyed my ideas for chapter 5. If you want to see achievement ideas for Poppy Playtime chapters 1-4, check out my other guide. I hope you liked these ideas, and tell me if YOU have any ideas. I have created a new guide on what I don't think will be in Chapter 5 to clear up anything major I've replied to in the comments. I believe that will act as a better way of conveying my opinion and vision of what chapter 5 would be. I am no game dev so don't take any of what I say personally or seriously.