Godzilla: The main protagonist of the series, Godzilla is portrayed as a lazy, overweight, somewhat selfish alcoholic who maintains a rocky but decent friendship with the Monster Island Buddies. He has been friends with Rodan and Jet Jaguar since childhood and grew up with an abusive father, who was killed by the Oxygen Destroyer. He also was once friends with Gamera until he dropped out of college after being brought to the future.
Godzilla is also a womanizer as he has two sons, Minilla and Zilla, the latter of whom reveals that Godzilla once had a relationship with Gorgo which ultimately went sour after Zilla was born. The same can be seen through Minilla by the disdain Godzilla shows in him constantly, and that he had divorced his first wife, Jirass in order to avoid him. At one point he also had a drunken one-night stand with Mothra (after believing that Rodan was dead). He was also once a drug addict until he was rehabilitated by Gamera.