Pengi

 Pengi is a virus from Mega Man Battle Network 3. It shoots icicles at its target that bounce between it and its target. It waves back and forth. When on ice panels, it is invicible to everything except Navi chips.

Pengi
 Pengi is a yellow variant.

Penga
 Penga is a red variant.

Pengon
 Pengon is a green variant.

PengiΩ
 PengiΩ is a blue variant.