Neoshadow

The Neoshadow is a Pureblood Heartless that is found in Kingdom Hearts Final Mix, Kingdom Hearts: Chain of Memories, Kingdom Hearts II, Kingdom Hearts 358/2 Days, and Kingdom Hearts Birth by Sleep.

Kingdom Hearts Birth by Sleep
When Ventus arrives in the Keyblade Graveyard at Master Xehanort's summons, he is suddenly surrounded by Neoshadows. Master Xehanort commands the Heartless to attack Ventus and forcefully unlock his heart, producing the Unversed Vanitas from its darkness.

Kingdom Hearts 358/2 Days
After returning to the World That Never Was in order to reclaim Kingdom Hearts and revitalize Xion, Roxas is attacked by several Neoshadows. He uses masterful swordsmanship to eliminate them, but is forced to side with Riku in order to finish off the rest of the continuously spawning Heartless. As soon as the Heartless are taken care of, however, the two Keyblade wielders turn on each other.

Design
A Neoshadow has a more humanoid body structure than a normal Shadow, but shares the same pitch black skin and spherical, glowing yellow eyes. Its crooked antennae are quite long and fall back behind the Heartless. It seems to be rather muscular, and its hands are very large, each one sporting five clawed fingers. Its feet, like those of a normal Shadow, are long and lack digits, but a Neoshadow’s feet more resemble boots. Its body is also lined by several faint, blue veins of color.

The name “Neoshadow” is derived from the prefix “neo-“, which means “new”, and “shadow”.

Strategy
The Neoshadow is stronger and faster than a Shadow, and is more strategic in combat. In Kingdom Hearts Final Mix, the Neoshadows are among the most difficult common enemies, working together as a team to defeat Sora. In Kingdom Hearts: Chain of Memories and Kingdom Hearts II, they are less rare and dangerous but are still more difficult to defeat than regular Shadows

Trivia

 * Although the entry in Jiminy's Journal says that their reaction command is Aerial Dance, the reaction command reads "Wind Dance" during battle.