|Date of Birth:||Unknown|
|Mass:||408 lbs. (185kg)|
|Appearance(s):||The Evil Within|
AlterEgo are enemies that appear in The Evil Within, pursuing and tormenting the player in many chapters. AlterEgo is the result of connecting a subject with dissociative identity disorder to the STEM device.
Once human, AlterEgos wear only the remains of their clothes, and the exposed flesh appears to be heavily disfigured. Some have sharp bone claws which protrude from their hands, dealing more damage than a knife or fists of regular Haunted. The main characteristic of this monster is the second deformed head which sprouts from its neck. This head has a big mouth full of teeth, which is used to bite and scream at the victims and can spit acid at the player. Sometimes, a tentacle exits from the chest of the AlterEgo, that end in a little, arachnoid-like monster, which will instantly kill Sebastian if it grabs hold of him.
The multiple heads (two from the neck and a third in the chest) symbolizes the multiple personalities of the original subjects. The dominant and alternate personalities are blended together into a single two-headed creature.
Although AlterEgos behave as a similar enemy type to the Haunted, they can both take and deal slightly more damage.
AlterEgos have an improved grab move that drains the player's health at approximately twice the rate of the normal Haunted. They also have a chest tentacle that will instantly kill the player character if he gets within range.
AlterEgos cannot be stealth killed and must be dealt with using weapons, environmental elements, or outright avoided. Note, however, that AlterEgos are susceptible to stomp kills if they spawn on a downed/ crawling position; a kick on a crawling/ downed AlterEgo will topple it to a vulnerable position for a simple stomp to finish it off thus saving ammunition and matches when the opportunity exists.
- The "dominant" head is the normally placed head (the one with the sharp teeth), as destroying it results in an instant kill. Exploding the human head doesn't slow the creature down; it still attacks.
- Its design is reminiscent of the cancelled Parasite Woman enemy from Resident Evil 4. Additionally, the tentacle exiting its chest resembles the Las Plagas parasite.
- The AlterEgo first appears in Chapter 7 as an enemy, though technically its first appearance is in Chapter 2, where one crawls on top of Sebastian in a nightmare.