In his normal form, Pierre is a large pink bird with a red polka dot pattern on his body. He's solid red on the sides of his head, the back of his head, and on his horn-like ears. He also has bandages wrapped around his torso. He has a tab face, with a yellow beak.
When in his hybrid bird-horse form, he transforms into a horse with wings that maintain the pink body with red polka dot design, but with white feathers. His face also elongates to that of a horse's. In a way, he is supposed to resemble a Pegasus.
Pierre ate the Uma Uma no Mi, a Zoan-class Devil Fruit which allows him to turn into a full horse.[1] This is supposed to allow Gan Fall to ride Pierre and travel in the skies, but as noted by the Straw Hat crew, since Pierre is already able to carry Gan Fall in his original giant bird form his power seems quite useless aside from the aesthetic effect. However, Pierre can use his powers as a horse offensively (albeit for comedic effects), by using his horse teeth to bite the head of anyone who's talking bad about his master in front of him.[3]
History
Sky Island Saga
Skypiea Arc
Pierre mainly served as transport for Gan Fall throughout the battle againstEnel, such as greeting the Straw Hat Pirates upon their arrival and carrying Conis away from a blast launched by Enel. Aisa also rode on Pierre after Gan Fall was forced to leave him behind to help her and Luffy escape from the giant snake Nola and later the two observed Luffy facing Enel before Pierre is knocked out when protecting Aisa from Enel's attack. Pierre later woke up at about the same time as the unconscious members of the Straw Hats just as Luffy finishes off Enel.
Water 7 Saga
Where Are They Now
Pierre drank pumpkin juice with Pagaya, while Gan Fall and the Shandia Chief talked.[4]
Pierre's name may be an allusion to Count Pierre of Provence, one of two titular characters of the French romance Pierre of Provence and the Fair Magelone. In Miguel de Cervantes's Don Quixote, Count Pierre is said to have fled with Magelone using Clavileño, a flying wooden horse gifted to him by Merlin; this connection extends further through Gan Fall, whose name is a play on Gandalf — a character many believe to be inspired by Merlin.