OctoNinja is a virus appearing in the Mega Man Star Force series. They resemble octopi with white headbands and a belt. They attack by first leaping into the air, then floating back down to spit a glob of ink at Mega Man. The ink has the unique ability of changing the terrain. What the change is depends on the variety of OctoNinja: OctoNinja changes the ground to grass, OctoIcer to Ice, and OctoPoison to poison panels. This ability is also present in the Battle Cards they give.