SMG3

He is SMG4's former evil doppelganger/arch-nemesis who was originally discovered trying to copy SMG4's videos and had attempted to kill him ever since then. He (and Wario) were the people responsible for turning Waluigi back to normal at the end of WOTFI 2018. After the T-Pose incidents, he retired from villainy to start a therapy television series called Dr. SMG3, which was first seen during the climax of the Waluigi Arc. It lasted until A Day In The Life Of Everyone where his therapy show was cancelled, and later started his own production company which was later destroyed, forcing him to go back to his evil ways. He eventually formed a plot to seize Susan Wojcicki's YouTube Remote and used its power to erase SMG4 and Susan from existence and take his place as a YouTube juggernaut.