Billiken operates as Kamome Sengakuji's Pata-Pi electronic pet, functioning as a futuristic piggy bank and counting machine that mirrors Kamome's intense focus on financial matters. This compact entity measures 29 cm in height and weighs 2 kg, featuring a hairless form and deep black eyes.

Its primary ability transforms it into the Diva Amphitrite, aligning with the series' theme of Pata-Pis representing mythological figures. During the film's events, Billiken engages in a pivotal fusion sequence where Kamome merges with Amphitrite. This occurs through a collective effort alongside fellow Cyber Team members aboard the Primum Mobile space fortress.