Wyvern

The Wyvern is an Emblem Heartless that is found in Kingdom Hearts and Kingdom Hearts: Chain of Memories.

Design
A "Wyvern" is a type of winged dragon with only legs and no forearms. In Kingdom Hearts they colored red and dark red wings.

In Kingdom Hearts: Final Mix they are colored blue with dark blue wings and feet and have a yellow stomach.

The name could also be a reference to the "Hiryū" of Final Fantasy II and Final Fantasy V, whose name was frequently translated as "Wyvern".

Strategy
Wyverns are able to maintain what seems to be almost effortless flight. Their feet never touch the ground, and they are able to soar to heights unreachable by Sora. These Heartless are capable of powerful ramming attacks, and corkscrew dives, both of which can be deadly and shave off respectable amounts of HP.

They are quite powerful, and attack with claws and a corkscrew charge. They have a tendency to soar high up in the air, and then swoop down vertically on the enemy, dealing damage.