Heartless
A "Shadow" Heartless, the most common type of Heartless

Heartless (ハートレス, Hātoresu?) are hearts corrupted by darkness, lacking a body or soul, and commonly portrayed as having bright yellow eyes and dark colors. They serve as the most common type of enemy the player must face in the Kingdom Hearts games. Heartless come in a variety of types, categorized by being Pureblood or Emblem, both reproducing by taking more hearts and transforming them into Heartless. Pureblood Heartless are black shadow creatures born of pure darkness. Emblem Heartless were artificially created and are labeled with the Heartless insignia, a heart symbol with a thorny cross. The Heartless obey those with strong will.[16] However, in worlds closer to darkness, the Heartless get stronger and become uncontrollable. They invade worlds through corridors of darkness—unpredictable pathways that interlink the many worlds.[17]

Nobody
A "Dusk" Nobody, the most common type of Nobody

Nobodies (ノーバディ, Nōbadi?) are creatures without hearts, and are predominently white or grey-colored. They are leftovers "born" in the in-between realm, and exist as the body and soul of people who lost their hearts to darkness.[18] As they lack hearts to possess light or darkness, they are "nothing" that still somehow exist within the Kingdom Hearts universe,[19][20] Unlike Heartless, Nobodies are able to attack with definite planning.[21] Several types exist, but the most common type is the "Dusk". The members of Organization XIII, being the most powerful Nobodies because of the strong hearts they had when they were "whole", kept human form while weaker ones assumed malformed, inhuman forms.[22] Most members of the Organization control one type of Nobody, suited to their fighting style.[23] Similar to the Heartless, Organization XIII and the Nobodies have an insignia, an upside-down, incomplete heart—which was designed to look like a splintered heart as a complement to the Heartless emblem.[24]

Unbirth

Unbirths (アンバース, Anbāsu?) are a third type of creature which will appear in Kingdom Hearts Birth by Sleep. They prominently feature the color blue and bright red eyes.[25]

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