Zem is an alien from Gasmoxia, and is one of Nitros Oxide's allies. He races for Emperor Velo the 27th along with Oxide and Zam in Crash Nitro Kart.
Not much can be told about Zem's personality, but it is known that he does have a strong sense of humor (though not the nicest one), and with his constant burping in the races it is obvious that he was made to be disgusting. He probably likes to eat a lot, since his lines usually have to do with eating. His victory stance is him skipping while swinging his arms. He is perhaps a troll or goblin like creature, as seen from his bald and grotesque-like looks.