"Hey what's the big idea, Uncle Mario?! This isn't the Minecraft movie!" Appearance Zack is a white cat with Sea Foam ears, hair, black eyes, dark-brick-colored cheeks and white face.

Personality Zack is shown to be a mischievous troublemaker. He often lies to, scares, and pushes around his two siblings, Katie and Cory. He is also very selfish. In SMG4: How To Train Your Mario, he first scares Katie and when Karen shows up, he denies the claim that he scared Katie. Afterwards, when he finished his dinner, he told Cory that he was a helicopter to distract Karen and took Katie's food. He is then grounded. He is pretty similar to Mario when it comes to annoying people. Zack is also naive and often watching content farms. He also has a soft side such as caring about his mom when they lost their home and befriending Beeg SMG4 when he was feeling sad and lonely (admittedly with some convincing from his siblings).