Zach is the son of two parents whom are both obsessed with aliens. According to Lincoln, Zach lives between a circus and a freeway.
He first appears in "Overnight Success", as one of the schoolmates that Lincoln invited to his sleepover, but because of Lincoln's sisters, he refuses to stay at his house.
He reappears again in "Lincoln Loud: Girl Guru", where he is one of the many boys seeking advice about girls from Lincoln. Lincoln then suggests he learn basic chemistry in order to get Kat to like him, much to his displeasure. Later, he accidentally burns Kat's braids in attempt to impress her with his chemistry skills. He then points to Lincoln, saying he told him to do it.
In "Dance, Dance Resolution", Zach, alongside Liam and Rusty, are seen unsuccessfully trying to get dates for the school's Sadie Hawkins dance. Later at the dance, Lincoln and Clyde recruit the trio's assistance, by having them handle the former's four dates, while Lincoln tries to hide from Ronnie Anne. Zach ends up having a good time with Giggles.
In "Back Out There", he, Clyde, Liam, and Rusty notice that Lincoln is standing outside Ronnie Anne's old house, and think that he is struggling with post breakup blues. They help him try to get over her by doing several activities together, and to find him some new girls.
In "A Fridge Too Far", he tells Liam he got corn for the answer on the test.
In "Be Stella My Heart", he falls in love with Stella whom she asked him for a laser tagging and happily accepts, much to Lincoln's, Rusty's, and Liam's jealousy. When Stella chooses Clyde for a Dance Dance Revolution, Zach becomes jealous with rage, punches the nearby drinking fountain, hurting his hand in the process. Later he pelted Rusty in the face with a dodgeball as payback for the mustard and gets pelted by Liam as payback for blinding him.
In "Tails of Woe", he brings up the rat beast.
Zach is a short kid with wild unkempt red hair, glasses, buck teeth, and freckles on his cheeks. He wears a white and blue striped polo shirt, blue jeans, and white sneakers.