Picopico-kun

The Picopico-kun (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. It was originally created by Dr. Light to protect his home. When Dr. Wily saw their effectiveness, he added a modified version of them to his fortress. 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

 * Pikopiko is a Japanese onomatopoeia, and kun is a Japanese title similar to mister and master.