SMG4, Mario, Woody, SMG4's friends, Henry and Samantha, etc.
Drill Finger, SMG3, SMG1, The Toddler, ???, Nintendofan996, etc.
SuperMarioGlitchy2 (also known as SMG2) is SMG4's brother. He looks like a blue version of Metal Mario and is pretty shivery. He's been mentioned multiple times. He makes his first actual appearance in the Super Mario Galaxy Longplay. Him and SMG4 get along well despite minor bickering.