In-game sprite from the original game.
Gapers will attempt to walk towards Isaac by taking the most direct route possible. If there is no way to reach Isaac, due to obstacles such as Rocks or Poop blocking the way, they will stand still and avoid moving towards Isaac until a proper route is created.
- A pair of Gapers may appear at the beginning of the boss fight with Monstro.
- In the Afterbirth expansion for Rebirth, touching a fireplace will become Flaming Gapers.
- "Gaper" is a person who stares, typically in amazement or wonder.
- The Gaper, Mulligan, Hive and Swarmer are all the same monster in stages of decay and infestation. The Gaper seems to be the fresh corpses, before decay sets in.