The Gup-B is a shark-styled Gup with one seat. Known for its fast speed and acceleration, it is Kwazii's favorite Gup. He mainly uses it for almost all the missions the Octonauts go on.
- Has an eject button to help Kwazii escape in emergencies.
- Has a turbo-button for Turbo power.
- Has retractable pectoral fins and moving tail fins for flight.
- Has a tiger shark camouflage.
- Some fish (like the Humuhumunukunukuapua'as) mistake the Gup-B for a shark and get scared.
- Kwazii once said that he painted the shark teeth on the Gup-B himself.
- The Gup-B obtains retractable pectoral fins and tail in The Flying Fish.
- Like the Gup-D, outside of flying fish mode, there is no visible way for the guy to move forward.