Huggy Wuggy Bullying Boxy Boo by Antiania on DeviantArt

Boxy Boo, Villains Wiki

Boxy Boo, GameToons Reloaded Wiki

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 by DJTundraIce -- Fur Affinity [dot] net

Boxy Boo - Box Surprise Boo Concept Skin (I made a concept for Boxy Boo based on the surprise boxes that a toy includes) : r/ProjectPlaytime

Boxy Boo Sings A Song (Project Playtime Poppy Playtime Video Game Parody)

Figure Poppy Play Time Boxy Boo Robot Huggy - Denmark

EVERYONE HATES BOXY BOO?! (Cartoon Animation)

Boxy Boo Sings A Song - song and lyrics by Aaron Fraser-Nash

Trychic Boxy Boo Plush Toy Project Playtime Stuffed Animal Plushie Doll Toys Easter Gift for Kids Children (Hamburger)