Compared to fellow FM-ians, Cancer is rather small in appearance with only Crown being comparable in term of size. His body is composed of teal-colored wave and red armor as his main body and pincers. The main body also has a small mouth and a crab-shaped emblem on it with a pair of eyes extending from the top. Each of the pincers also have blue stripe on it. Unlike normal crab, Cancer only has two legs.
He usually transforms into Cancer Bubble to battle Mega Man.