Kurosai FR-U IV

Among the newer machines slotted into the Soldier Dock aboard the Thousand Sunny, this one occupies the fourth bay, a compartment left vacant until its arrival. Its designation translates as Black Rhino FR-U 4, and the FR-U portion conceals a pun: the letters stand for General Franky's Arms, a nod to how the vehicle turns into the giant robot's limbs. The rhino theme carries its own wordplay too, since the Japanese term for that animal, sai, hides inside Franky's Cyborg epithet.

The vehicle is a massive black three-wheeler capped by a helmeted rhinoceros head, and the crew's familiar star sits on both of the rear wheels. Cast from Wapometal, it hits hard enough to smash straight through packed rows of foes, and once it builds sufficient momentum the charge can even knock Big Mom off her feet. Its defining trick is assembly: once the Brachio Tank V links up to it, the machine turns into the arms of the Iron Pirate General Franky.

Franky is the one at the controls. Its first outing came on Fish-Man Island, where the Hyper Toxin Squadron of the New Fish-Man Pirates moved to poison Nico Robin; immune to their barbs and venom, Franky rode the machine straight into them and ran the squadron down. After Daruma trapped the vehicle and the Brachio Tank V in a pit, he combined the two into General Franky. He brought the bike out again during the strike on Onigashima in Wano, carrying Brook along, and on the Live Stage he crushed Big Mom's face beneath its rear wheel. Once he pried the Brachio Tank V loose from Jaki, he docked the pair once more to form General Franky.