Haunter is a purple, ghost-like Pokémon with a roundish body with a pair of disembodied hands with three digits floating in front of it. Haunter possess a trio of spike-like protrusions on either side of its face, and what appears to be a tuft of messy fur hanging beneath it. It has triangular white eyes with tiny black pupils and a mouth with several sharp, purple teeth.
Haunter's powers are stronger than a Gastly. With Haunter's newly developed hands, it can now use physical attacks, such as Poison Jab.
Haunter hide in very dark places, where they plot to take the life of the next living thing that comes near. It then silently stalks its victims. It has the ability to float through solid walls, and many people believe that Haunter is from another dimension because of this ability. It has also been known to entertain and prank people.
Haunter live in or near graveyards, and dark, abandoned caves. They can be found primarily at night. Haunter's natural range includes Kanto.
Haunter seem to eat by first paralyzing their opponent with Lick, then draining a bit of their life force. It is also said to eat people's dreams by going inside them and scaring them to death.
They have also been known to eat other foods, such as Berries, Pokéblocks and Poffins.
This Pokémon was unavailable prior to Generation I.