"Hold your fire, we're officers not maniacs"
Gyaosu first appeared in second chapter of the one-shot Wonder Island, as the boss of Gala and Pagos. He summons Dirty Harry, aka the "top shooter in the world", at the Los Angilas police office for a vital mission. While waiting for his arrival, Gyaosu and his men play war between Ultraman and Godzilla. When Harry arrives, Gyaosu asks him to stop a dangerous criminal who said that Gyaosu was "an old bald cross between Astro Boy and King Kong", and who is now taking refuge on Wonder Island. Some point after the events of Wonder Island, Gyoasu, Gala and Pagos are transferred to Penguin Village.
Later, Gyaosu leads the Penguin Village Police Force when a Bank Robber holds hostages in the Soramame Barber Shop. Gyaosu keeps telling Polly Buckets to not shoot the building when Kurikinton shoots Gyaosu in the head. The Penguin Village Police Force arrest the bank robber thinking the shot was from him.
Gyaosu is seen again when Arale is being a good citizen and constantly gives the police everything in Penguin Village saying it is lost.
He is told by Taro Soramame that the someone from the Red Ribbon Army is in town. He and the rest of the police force get armed up to take him on. They begin to head out but then get distracted and waste their time taking out King Nikochan's spaceship instead.