Void Steve

Void Steve is an evil steve that Sabre, Rainbow Steve, and Galaxy Steve fought for a while.

Steve Saga
In the Steve Saga, Void Steve first showed up destroying all the land near Sabre and Rainbow Steve. Throughout time, he killed Rainbow Steve, and caused many chaos. Eventually Sabre and Galaxy Steve defeated him, but the loss of Rainbow Steve will never be forgotten.

Rainbow Quest
Recently Void Steve has been hinted twice in Rainbow Quest. In the episode where Faceless was destroyed, he had turned into him. He is hinted in the thumbnail of a different episode, yet it has nothing to do with him.