Upon discovering that his real name is Zach, Gumball begins to act and dress differently and wishes to be called Zach.
It is discovered that this alter ego is taking over Gumball by altering his memories, up to the point where Gumball does not remember what his nickname is or what he has done as "Zach." The Wattersons decide to make "Gumball" his legal name before Zach takes over completely. Gumball soon defeats Zach, and he disintegrates.
Zach is almost identical to Gumball, aside from occasionally wearing purple sunglasses, and popping out his collar. He speaks in a deeper voice than Gumball, while usually raising his eyebrow at every appropriate moment.
Zach is boastful, confident, arrogant, and generally full of himself, as seen in a stereotypical rude jock.
Unlike Gumball, who recognizes his own failures and lives with them, Zach refuses to acknowledge any of his shortcomings or losses, going so far as to alter the memories of his/Gumball's failures to turn them into victories. He also views Gumball as a loser.
He typically rides a purple skateboard around everywhere and refers to himself in the third person while mentioning fake "cool" memories he has done with them at his school.
Zach is a memory manipulator. Each time Zach claims a victory in one of Gumball's memories, Gumball slowly fades away. He uses all kinds of weapons, like a bazooka while attempting to blast Tobias, and a tennis racket to attack Carlton and Troy with multiple tennis balls.
- "The Name": His only major role. He gradually takes over Gumball, and thus must be defeated.
Click here to view the gallery.