Chopper (One Piece in Love)

Chopper is simply an ordinary deer, sporting a pair of large antlers and usually kept on a rope lead. The running joke is that there are really two animals sharing the name, and telling them apart comes down to their horns. The anime gives the original deer spots running down his back as an added distinction.

As a domesticated animal, Chopper has barely any character to speak of. He is calm and easygoing, content to be handled, and now and then he enjoys a game of fetch with Yamamoto Luffy.

While touring a zoo with Yamamoto Luffy and Koyama Nami, Nakatsugawa Usopp noticed the deer and decided to stage a rescue, carrying it off and christening it Chopper so it could join his crew. During that same outing a lion broke free of its pen, and Usopp put it down with explosives. Grateful for the help, the zoo handed him an improved deer to replace the first, which is where the two-Chopper gag originates. From then on the deer hangs around with the Pirate Club as a full member and its official pet. The anime quietly dropped the twin-deer idea, having Usopp simply bring the original animal back to school.