Location: Most locations
Attack Method: Zombified-looking canines with long tongues used to drain life from their victims. Come in both male (yellow-green) and female (pinkish), with the females being more aggressive. They leap at Henry as he walks by.
Best Tactics: They can easily be beaten with any kind of melee weapon or firearm, and you can even sneak by if you're careful enough.
Location:Outside Room 302
Attack Method: Appears as an upside-down torso that walks on its hands. Looks very similar to the Twin Victim.
Best Tactics: Slightly stronger than the twin victim; use similar tactics (a powerful melee or firearm) or push past them.
Attack Method: None
Best Tactics: A benign enemy, this huge creature stretches like an umbilical cord throughout many levels. It pulsates and may be attacked, but not killed.
Location: Building World
Attack Method: Decayed, ape-looking monsters that come in two versions - "Old Type" and "New Type", with the latter seeming more aggressive. They often pick up melee weapons and use them against the play
Best Tactics: Be aware of the fact that they are often carrying weapons and have the same range as Henry. Try attacking and then backing off, or strafing strategically.
Location: Forest World / Building World
Attack Method: Small, bat-like creatures that attack with a long needle-like beak. They usually come in packs.
Best Tactics: They're fairly weak, so a shot with any melee is usually enough to subdue them. Bug Spray is also effective.
Toadstool / Whitestool
Location: Water Prison
Attack Method: Groups of either rust-colored or whitish fungi that wave erratically but do not attack.
Best Tactics: The only way damage can be taken is if the player walks into them. Toadstools are slightly more damaging and can grow from spots where a monster was previously killed.
Attack Method: Leechlike monsters that usually come in hordes of many sizes
Best Tactics: They do no damage unless they fall upon the player from above and are easily killed.
Location: Subway World / Outside Room 302
Attack Method: Humanoid creatures that extend from the wall at waist-length and attack with their hands.
Best Tactics: Stand directly to the side and attack out of their range with a melee or firearm.
Attack Method: Ordinary wheelchairs possessed by ghosts, they move on their own, often in a linear and repetative fashion. Shadows of a sitting figure can be seen in them.
Best Tactics: Run. Henry suffers headaches when around them and they cannot be killed.
Location: Hospital / Outside Room 302l
Attack Method: Very tall, feminine monsters that wield close-range weapons.
Best Tactics: Use charged attacks or simply run.