Ravioli is an inventor boy living in Inoshika Town. He first meets Kanipan at the Robot Grand Prix, becoming his rival. Though initially unlicensed, Ravioli's inventive skills rival Kanipan's.

He instantly develops romantic feelings for Milk upon meeting her. His clumsy and comedic missteps consistently thwart his attempts to gain her attention. Ravioli persists in pursuing her affections despite Milk's obvious feelings for Kanipan.

His large, superhumanly strong Interface Robot, BK, accompanies him, communicating solely with the word "Hunga."

Five years later, during the second season, Ravioli matures physically into adolescence. His personality shifts toward greater calmness and observation. He obtains an inventor's license and officially participates in the Robot Grand Prix.

His role evolves into a support capacity for the main group, mirroring Kid's function. While aware of Milk's enduring feelings for Kanipan, he becomes more understanding of her emotions. Near the series conclusion, Milk kisses him, promising "I'll continue when I come back."

The original BK robot is absent in the second season, replaced by a new model called BK Mark 2. Ravioli stows away on the spacecraft, departing Planet Sharaku alongside Kanipan, Kid, Milk, Igor, and Angelica. His name follows the series' food-themed naming convention.