Delta Steve

Alpha Steve may be a horrible person with dark intentions working alongside Fury Steve to destroy Yellow Steves. However, within him, a dark version of him was unleashed. He freed himself from the clutches of Alpha Steve. You see, in order to create Alpha Steve, Fury Steve captured and forced a Red Steve to merge with Alpha Steve in order to create him. That Red Steve was trapped inside of Alpha Steve for a while until it broke free. However it was no longer the same. The amount of energy surging through him was painful enough to warp his mind even further than Alpha and Fury Steve. He became mental. A deranged maniac hiding within an immortal body.