The Crawler is a gigantic, apparently mechanical Heartless with a body structure reminiscent of that of a tortoise. It has a large, roughly conical body. Its body is predominantly light green with dark green highlights. It has two turquoise crests on either side of the top of its body. Its four conical legs attach to the lower half of its main body. All four legs are dark green with jagged, red highlights and end in yellow-green spikes. Its head is relatively small and is dark green with a jagged, light green lower jaw. Its glowing yellow eyes are encased in a translucent dome on the top of the Crawler's head. This dome sports a dark green antenna with a curled tip, and the Heartless emblem is on its chin.
The Crawler's name references its method of locomotion; it walks very close to the ground, appearing to crawl.
It has a limited attack, but extremely high hit points. Defeating one requires Sora to shoot and destroy each of its four legs, making it collapse and explode, granting a reward.