A Gigas Shadow has a vaguely humanoid body structure. It has a round, spherical head with circular, glowing yellow eyes. It also has two long, twisted antennae sprouting out of the top of its head. Each of its hands has three clawed fingers, and its feet are large and lack any distinguishable digits. With the exception of its eyes, this Heartless's body is completely pitch-black. The Gigas Shadow is identical to the basic Shadow and Mega-Shadow Heartless, but is much larger than either of its two relatives. In Kingdom Hearts Final Mix, they are simply normal sized Shadows that gradually grow to their limit, possibly a reference to Sora's use of the shrinking potion.