Ramie Yoshino/Misc.

Character design
When the author designed his protagonist group, he wants the doctor to be a girl who likes cute things, making it a mix of the canon characters Tony Tony Chopper (despite being a boy) and Perona. He then chose the name Sachiko to be the name of the character. He also designed her to be the smallest girl in the group, which remains until today. Originally, the author also wanted her to be the youngest member in the group, but sometime he chose the newly joined horse-human Kaiser Slautern to be the newest member of the group.

Coincidental canon universe counterpart
Coincidentally, there is a female character in the Ship of Fools named  who looks like Sachiko Oita, being kawaii-ish nature and having long, pink hair, all except for the eye color. Sachiko's blue eyes saved her from being an exact Sea of Fools counterpart of this character (Gourd Roger admits it).

Trivia
TBA