Zaku

Zaku (ザク) is an enemy from Mirai Ninja. These green ninjas appear on the second, third, fourth, sixth and eighth stages; they do not move, but attack by swinging their maces around in an anticlockwise direction (and occasionally swinging them directly at Mirai Ninja). The only way Mirai Ninja can avoid getting hit by their maces if he is close enough to them is if he crouches down while attacking them (as they will be just above his head) - and they are worth 3330 points.