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He is a nerdy and condescending student who is more or less one of Luna Platz's flunkies and is extremely loyal to her. Zack seems to be very insecure with his height and tries numerous ways to get taller; he is also afraid of heights. He usually gets information off of his own website, the "Zackpedia". After discovering that Geo Stelar is Mega Man, Zack starts to admire him more. He, Luna, Bud, and Geo usually help test out Tom Dubius's new upgrades for the Star Carrier. In most cases, he acts and looks sarcastic.
Zack is the only one of Geo's immediate friends who has not Wave Changed, against their will or otherwise, though he does get a Wizard named Pedia in the third game, thus making a pun with their combined names, "Zackpedia", the name of his website.
Zack follows Bud and Luna, and is just a bystander. Although after completing the game twice he notices a strange sound coming from the school piano after completing the side quest, defeating 10 waves of Jammers you then become his Brother.
In the 2nd game, however, he, Bud, and Sonia are swallowed by black holes created by Solo. Although Geo and Luna follow him all the way to a different location called Loch Mess (which is named after Loch Ness, a real place) Zack decides to find Messie, a sea monster, instead of going back, as he feels as though locating Messie is the only way he could gain an achievement that he could be proud of, due to his insecurities about how most of his friends have accomplishments to brag about whereas he doesn't. However, while searching for Messie, he ends up stumbling on Gerry Romero summoning the Messie sub and overhearing that he actually faked Messie's existence, and ended up trapped in the sub in order to silence him, which proceeded to sink to the bottom of the Loch.