Huggy Wuggy is presumed to be the one who wrote the countless words within the walls during the Vent Chase. This however can be proven as false, as three different entities can be depicted talking to us throughout the Vent Chase via the conveyor walls.

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While walking, Huggy has a stiff, yet rather lithe and oddly organic-looking gait. He is capable of breaking into incredible bursts of speed, using his long arms and legs to propel himself forward. While crawling through the vents after the player, Huggy is able to bend and contort his body to fit into tight spaces. Before the player drops the crate onto Huggy on the catwalk, he can be seen sprinting towards the player on all fours, much like an ape. Due to his sheer height of a whopping 18 feet tall, he possesses a size advantage against average humans. During the vent chase, Huggy is able to cut off and keep up with the player by navigating through the ventilation system.According to Micah Preciado, Huggy Wuggy was not actually inspired by any animal like a dog. Instead, he was unironically inspired by Sour Patch Kids [2]. However, this has been proven false, as it turns out the eyes assumed to have been viewed as a reflection of the floor. In a trailer headshot close-up of Huggy, it seemed that behind his plastic "eyes" lie big shot, human-like eyes. This is evident by the fact that some writings say "Starving" and "I'm so hungry." Further proven by the fact that he seems to eat you when you die. His monster counterpart remains largely the same, with the exception of his eyes being dilated bigger than intended, giving off a deranged and disturbing physique. Behind his lips is a maw of dozens of jagged needle-like teeth. Closer observation of Huggy's mouth shows a secondary set of jaws located by his throat, akin to that of a Moray Eel.

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As a toy and mascot, Huggy Wuggy is demonstrated to be warm and welcoming, giving anyone warm hugs. He is also noted to be quiet and doesn't speak often, thus preferring hugs as his interaction method. However, his monster counterpart, 1170, shows him to be a murderous creature, slaughtering anyone he encounters. While chasing after the player, Huggy constantly wears a deranged toothy smile, suggesting that he enjoys hunting his victims (or more simply that his anatomy prevents him from not smiling). When Huggy catches the player, he bites into their face, killing them.In Log 08502, Huggy was briefly mentioned as Experiment 1170, and was dubbed the most optimal subject, as he possesses the ideal amount of intelligence and is obedient to the scientists working at the company. After managing to momentarily escape Huggy and landing on a brittle catwalk, the player pulls a crate onto the crumbling structure just as Huggy bursts from the vents, causing it to collapse. Though the player manages to land safely on another catwalk not far below, Huggy strikes the railing and proceeds to fall into the abyss on the facility, slamming into several pipelines and leaving behind dark red blood splatters.