Green Devil

The Green Devil (グリーンデビル) is another Devil type robot (except the body is made out of green slime instead of nanobots), that appeared only in Mega Man 8 and Mega Man and Bass. He attacks like the other devils in Mega Man 8, except he can turn his goo into spikes or rush forward as a wave of goo.

In Mega Man and Bass, the Green Devil is the first boss and it cannot dismantle himself across the screen to attack. Instead, he stands in the same place and throws parts of his body at the enemies. It covers King's escape from the Robot Museum.

In Mega Man Legends 2, there is a Reaverbot boss called the Rimblemenji which is similar to the Green Devil.