Billy

Billy (ビリー) is a giant electricity producing bird from the tenth One Piece movie. He was originally a creation of Dr. Indigo, but he aids Luffy in fighting against Shiki in the air.

Appearance
Billy is giant yellow bird that looks like a cross between a duck and a peacock. He has the head and beak of a duck, but the rest of his body is that of a peacock, the latter is made even more apparent when he opens his fan-like tail. Billy has giant wings, unlike the creatures that he resembles, and can use them to fly. He is usually seen with a runny nose. Due to the special chemical that was developed by Indigo and given to him, Billy is actually much bigger than he is supposed to be normally.

Personality
Unlike the other mutated animals on Merveille, Billy is quite friendly and mild-mannered, although he is short tempered, as shown when Luffy pulled on his cheek. He is also prone to panic as shown when he thought Nami had drown. Despite this however, he can be loyal and courageous.

Relationships
Because Billy produces electricity from his feathers, not many people get close to him out of fear that he might zap them. The only ones to not completely fear him are Nami and Luffy. The latter of which gave him the name Billy. Luffy derived this name from Biri Biri which is the sound effect for electricity in Japanese.

Abilities and Powers
Billy is a special type of bird created by the SIQ that produces electricity from his feathers. Despite being rather small compared to other mutated animals, he is able to generate enough electricity to take out large groups of animals quite easily. He is also capable of flying at high speeds and altitudes while carrying a person.

Trivia

 * His species is known as a Thunder Bird (雷鳥,'Raichou'). Coincidentally, 'Raichou' also translates to "Rock Ptarmigan".