Mozu and Kiwi

Mozu (モズ, Mozu) and Kiwi (キウィ, Kiwi), also known as the Square Sisters (スクエアシスターズ, Sukuea Shisutāzu) due to their square-like hairstyle, are very loyal to Franky, and go with him everywhere. Mozu is the sister with the yellow bikini and straight edged hair, while Kiwi is the sister with the red top and curly edged hair. They have a tendency to mimic his reactions. They often walk sideways in high winds due to the fact that they are blown back.

History
The earliest history of the two girls was that they were seen riding the Puffing Tom on its opening day are them when they were kids. They were inspired by this event and tried to be shipwrights. They however failed the Galley-La company tests and turned bad. They were then found by Franky and started working for him.

When CP9 invades their hideout, they are knocked down and out by Kalifa for not letting them in. Later when the Straw Hats chase after the sea train, Puffing Tom, with the Rocketman. Mozu and Kiwi along with the rest of the Franky family, accompany them to the government headquarters, Enies Lobby, as Franky was captured by CP9. Once there they help hold off the naval marines to allow the Straw Hats go on ahead and try to rescue Franky and Nico Robin. They were blown into the Enies Lobby waterfall by cannonfire, but are currently safe thanks to the giants and Paulie.

Cameos and Crossovers

 * The Square Sisters appeared in the game Jump Ultimate Stars for the DS.

Trivia

 * In a recent Japanese Fan Poll, Mozu & Kiwi are currently ranked as the 38th most popular characters in One Piece.
 * Oda seems to enjoy naming women after birds, and this trend continues with the Square Sisters, Kiwi is named after the Kiwi, Mozu is named after the Bull-headed shrike (Lanius bucephalus), or in Japanese, Mozu.