Mozu and Kiwi
The Square Sisters (スクエアシスターズ) are Franky's inseparable companions—they go everywhere with him and are fiercely devoted. They're called that because of their distinctive square-shaped hairstyles, which actually dictate a lot of their behavior. When the wind picks up, they have to walk sideways to keep from getting blown backward, which is pretty impractical but funny to watch.
Mozu wears a yellow bikini top and yellow slacks with straight-edged hair, while Kiwi has a red bikini bottom and red top with curly-edged hair. In fights, they'll pull out samurai swords, though they're not particularly strong—Franky and Kalifa took them down without much trouble. They're more known for mimicking Franky's reactions and mannerisms than for any real combat prowess.
Their most recognizable quirk is ending nearly every sentence with "Waina," a speech pattern that goes all the way back to their childhood. It's become such a core part of how they talk that fans can't imagine them without it.
Content compiled by AnimeList.moe from publicly available sources.
