You know how Deltarune has "Shadow Crystal" bosses??? Well, in this Horror DLC there instead will be what you call "Puppet" bosses. These are mostly the major Darkners who fell victim to Kami and got reincarnated into her design. You can either fight them (you end them forever) or spare them (which will free them from their strings and they will thank you).
The image is a meme and is not related to my subject WHAT THE HAIL MAN? (the meme is for those who KNOW.) Toby Fox for Spamton