Bakemon

Bakemon is from the Digimon series. A Ghost Digimon, Bakemon is said to be a product of "Death Evolution", when a Digimon's data is incompletely deleted that results in a undead-type Digimon.

Abilities
They are known to take the form of any human or other Digimon.

Digimon Adventure
Joe and Sora, along with their partner Digimon Gomamon and Biyomon, encountered a group of people at a church which were really Bakemon in disguise. The Bakemon wanted to eat the two humans as part of their ceremony. When all the Bakemon merged into one large Bakemon, Biyomon and Gomamon Digivolved to Birdramon and Ikkakumon to fight him. With the help of Sora's hat, Joe beated a chant saying "Bakemon, lose your power." which weakened him. Birdramon and Ikkakumon destroyed him. Later on, another bunch of Bakemon worked for Myotismon and some followed Myotismon's minion Phantomon.

Digimon 02
In the Digital World's Death Valley (Land of No Return in dub), The Digimon Emperor had control over the Bakemon with his Dark Rings. He had them take the form of Yolei, Cody, T.K., Kari and their Digimon partners suspended over a Deltamon which was also under the control of the Dark Ring. The plot was to make Davis choose which one to save from Deltamon's triple appetite. When Davis offered himself, Digmon appeared with the real DigiDestined and their Digimon. Davis got mad and Armor Digivolved Veemon to Flamedramon after the Bakemon reverted to their true forms. Nefertimon, Pegasusmon ansd Halsemon took out the Bakemon before attacking the Control Spire. Some more were seen in the Digimon Emperor's base where a few were destroyed by Kimeramon. Some Bakemon crashed Matt's concert on Christmas Eve. When Digimon started to appear in the Real World, three Bakemon were seen in New York.

Digimon Frontier
Some Bakemon were seen at the Fortune Teller Village and the Autumn Leaf Fair.

V-Tamer
A Bakemon was an underling to Myotismon and posed as a Patamon.