SMG3 is a member of the SMG4 Crew, being SMG4’s archnemesis. His name stands for Super Meme Guardian 3 or Super Mario Glitchy 3, but a lot of people call him by the name of Three.
He also started as a recolored version of Mario but then he had to change his appearance to his current form. He was the main antagonist during the Classic era, and a minor antagonist for the Modern Era until The YouTube Arc, where he was once again the main antagonist. This changed when he was banished soon after the War of the Fat Italians 2020. He also has the ability to use meme guardian’s powers, but that has to be alongside SMG4.