from the first game.
Squid has a look very similar to that of an aquatic squid. It has a triangular shaped head with 2 eyes, a mouth(?), and 4 appendages.
It's sprite is 8 pixels high and only 8 pixels wide, which added to the speed of the advanced stages of a game makes it the hardest character to hit.
Like the other two classic enemies, he shoots a laser downward and moves from left to right and back again coming down. One hit from the cannon should get him.