Picopico-kun

The Picopico-Master (ピコピコくん) is the boss of the second Wily stage of Mega Man 2. It is a guard system room with blocks that form into mini-robots. They attack by simply flying toward Mega Man. When enough of these enemies are defeated, the room simply shuts down. Bubble Lead can defeat the robots with one hit, but as it may be difficult to hit them with it, it is recommended to use Metal Blade instead.

Trivia
Kun is a Japanese title similar to mister and master.