UFO

UFO is a family of viruses from the Mega Man Battle Network series. Although they never directly attack, they do steal the target's Battle Chips during the battle by charging into it. They never appear alone.

RedUFO
RedUFOs are orange and brown. When charging, it becomes pink and red.

BlueUFO
BlueUFOs are light-blue and dark-blue. When charging, it becomes pink and blue.

GreenUFO
GreenUFOs are green and dark-green. When charging, it becomes light-green and green.

Trivia
UFO's design was based on the Fujiko F. Fujio character Zashiki Boy.