Deer Man

Early in the game, JJ is struck by lightning and set on fire. A moose (technically, a moose is a type of deer wearing a doctor's outfit and possessing a human body rushes over to her, and stands over her body, repeatedly saying phrases such as "cardiac arrest" and "major hemorrhage." JJ soon regenerates her body on her own will, and gains the newfound ability to regenerate after experiencing severe injury.

The Deer Man shows up in several other locations. He shows up in the form of a human statue with deer antlers in a catacomb, repeatedly saying phrases such as "please wake up" and "uwooooo." He later shows up on the roof of the diner, and again hiding behind a cardboard cutout in a bowling alley. He makes a brief, nonspeaking appearance in Moosefoot College.

The Deer Man makes his final appearance at the end of the game, after JJ reunites with Emily. He rushes in saying "weeeooooo, weeeooooo," then says "please wake up", and "administering shocks", before gaining lightning power in his hands, which he uses to repeatedly shock JJ. As JJ is shocked, the image briefly flashes to what appears to be a different person lying on the floor of a gym, being tended to by medics.

After several shocks, we see Male-Presenting JJ wake up, as a medic says that FK helped stop JJ's bleeding. The medic asks JJ what she sees, and she looks over at a moose head, and says, "A deer."

With it now being revealed that the events of the game were a dream had by JJ after a suicide attempt, it's now clear that the Deer Man is a combination of the medic trying to revive JJ in the real world, and the moose head that JJ may have seen before attempting suicide. The things the Deer Man says in the dream - "cardiac arrest", "please wake up", "major hemorrhage" - are all medical terms, while the vocal "sound effects" he makes are medical sounds, such as "weeeooooo", the sound of an ambulance, or "beeeeep", the sound of a defibrillator. JJ may have been subconsciously hearing these sounds in the real world, causing them to enter her dream.

After winning the game, players are given a text message by the Deer Man providing them with many statistics, some of them silly, as per Swery's sense of humor, similar to what Deadly Premonition did.