Kingdom Hearts II/Heartless

Shadow
The most common heartless. It is pretty easy to beat.

Rapid Thruster
One of the most common enemy in the game. In large groups, use Aero Trap to defeat multiple Heartless at once. In small groups, just jump and attack.

Bulky Vendor
The rarest Heartless. It is found anywhere breakable objects (suits of armor, fireworks stands,etc). Wait as long as possible to use the Reaction Command.