Pukapucker[1] is an enemy first appearing in Mega Man 5. It is a robot that comes in two parts: a walking torso with feet, and a detached, round head hovering above it, which is its weakpoint.
In Mega Man 5, Pukapuckers appear only in Crystal Man's stage, all in the early sections. The torso walks left and right, either to the edge of a platform or within a set range, while the head stays directly above it and floats up and down.
If Mega Man opts to destroy the body first, the head will stay behind and bounce around like a ball, starting in the direction it was last facing. If he destroys the head, however, both the head and body will disappear.
Mega Man IV
Sprite from Mega Man IV.
Pukapuckers return in Mega Man IV, once again appearing in that game's version of Crystal Man's stage, but also in Dr. Wily stage 2 (Dr. Wily's spaceship). They behave similarly, but are slower than they originally were, in exchange for dealing an extra point of damage when touched.
The lower part of Pukapucker looks very similar to that of Nobita, a different enemy in Mega Man 5 with an extendable neck and similarly limited walking range.
References
↑Mega Man: Official Complete Works art book, 2009.
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