Robson

A sizable White Walkie, Robson is draped in long white fur and resembles a hippopotamus in overall shape. His legs are notably long, and Wapol has fitted a saddle onto his back so that he can be ridden.

Although Wapol was responsible for killing his brothers, Robson stays devoted to him. That devotion is tied to the rewards Wapol regularly hands out whenever the beast obeys an order. As a White Walkie his legs can extend, granting remarkable climbing ability, which let him scale the Drum Rockies while bearing Wapol on his back.

At some earlier point Wapol killed a number of Robson's brothers and claimed the survivor as his riding animal. Robson was put to use when Wapol first came back to Drum Island, and noticing the beast's irritation, Wapol handed over a treat to keep him cooperative. He stood quietly as Wapol proclaimed his retaking of the island in Bighorn, then dozed off while his master fought Dalton. As an avalanche bore down, Robson stretched his legs to lift Wapol, Chess, and Kuromarimo; they were still swept up but escaped once Wapol ate his way free of the snow.

The beast still bore Wapol on his back as the king initially squared off against Luffy, and he was stunned when the Lapahns came to Luffy's defense against Chess and Kuromarimo. He remained at his master's side on arrival at Drum Castle and stood by during the fight against Luffy and his companions. When Luffy landed a punch, Wapol was sent flying into Robson, hurling the White Walkie far into the distance, never to be seen again.