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This is the Dark version of Y/n aka SMG5 along with his Dark Fleetway form as he is the true main villian of season 2 of the Legend of the SMG5 Series as he was created after Y/n aka SMG5 was betrayed by Waluigi to gain full power of his rejection, which resulted in creating Dark SMG5 by the power of betrayal.

Then he gained a new form after defeating Waluigi in a battle to the death and stole all of his rejection power to become Dark Fleetway Y/n (SMG5) until he was soon defeated by the gang along with Wario and Waluigi as Y/n was brought back to normal.

However, Y/n's dark counterpart made a return as a sentient being and teamed up with Star Wolf before they both formed a team of Evil villains.