Heartless

Heatless are the main creatues which Sora, Donald, and Goofy fight against in Kingdom Hearts I and II. They are the remaining body of someone who has lost their heart and has nothing less to turn into but darkness. They are ruled be the evil queen Maleficent but take orders from the strongest being of darkness around.

Pureblood Heartless
The original type of Heartless, and the most common. They are completely black with piercing yellow eyes and antennas, and have the ability to teleport by sinking into the ground and moving incredibly fast. Sora faces these species many times during his adventures, especially near the end. Examples include the Shadow, Darkball and Darkside Heartless.

Emblem Heartless
The biggest variety known, Emblem Heartless are plastic-looking, colored Heartless, modified by "Ansem" to gain more power when collecting hearts. They represent the biggest part of the Heartless enemies and bosses in both games. Examples inlude the Trickmaster, Shaman and Groundshaker Heartless.

World-Themed Heartless
Normally, the Emblem Heartless sometimes appear as more authentic versions to the World's nature and laws, even going as far to appear only in that specific world (example: the Fortunetellers are Arabic-themed Heartless, thus only appearing in Agrabah, and etc).

Emblem Heartless
Note- A name in bold denotes a boss.