Yoko

Yoko is a little girl in Little East Blue who takes up her father's job as its protector. She is always seen wearing a Marine uniform, which belonged to her deceased father.

Personality
Yoko has a habit of biting people's heads who aggravate her. She also has a raw hatred to pirates due to them killing her father, believing them all to be evil, coincidentally sharing the Marines' view on Absolute Justice, until after getting to know the Straw Hat Pirates, which eventually changed her view.

Ryūdō
Ryūdō is Yoko's deceased father. They loved each other very much, and when he died from a pirate attack, she developed a raw hatred towards pirates.

Boss
Boss is a giant mutated beetle who was meant to serve the Golden Lion Pirates, but escaped and eventually met up with Yoko three years ago. Its mighty strength reminded her of her father, so Yoko and Boss has since then became friends.

Straw Hat Pirates
As Yoko has a hatred against pirates, she immediately believed that the Straw Hat Pirates were evil, and was the only person in Little East Blue to reject them. However, after seeing them protecting the village and Boss, she changed her views and became friends with the crew.

History
Yoko was once the daughter of a Marine who decided to defend Little East Blue by himself. Five years ago, he died and left Yoko all alone. Saddened by his death, Yoko decided to wear his uniform and take up his mantle as the protector of Little East Blue.

Three years ago, she met Boss, a gigantic fire breathing beetle. Because of its strength which reminded her of father's, she became friends with the creature and they have been protecting Little East Blue since then.

As it was pirates that killed her father, she has a very raw hatred of them and is the only one who doesn't take kindly to the Straw Hats when they stumble upon the island, believing that all pirates are evil. However, after seeing how strongly the Straw Hats are protecting Boss and her Island, her views change towards them, even warmly saying goodbye to them as they left.

Trivia

 * Yoko and Nami has several similarities: they both have a similar appearance, both lost a parent who was a Marine due to a pirate, and both despised pirates and thought of them as evil before meeting with the Straw Hats.