Boxy Boo And Kissy Missy by Antiania on DeviantArt

Boxy Boo Backpack

Boxy Boo Plush Toys Project Boxy Boo Plush Toy For Boy Girl Or Horror Game Fans Halloween Party

ArtStation - Concept Art Boxy Boo Skin

boxy boo PROJECT PLAYTIME by earlrd on DeviantArt

It's not a new character attacking Bron, those are Boxy Boo's padded claws. You can even hear their crank turning 3 times before and their jump scare sound as they attack Bron.

Boxy Boo Play time, Poppies, Craft activities for kids

Project Playtime - Boxy Boo Gameplay

Figure Poppy Play Time Boxy Boo Robot Huggy - Denmark

Paper Boxy Boo! by Keychamp14 -- Fur Affinity [dot] net

Boxy Boo Playtime - 3D Animation - PixelBoom