She is young girl who lives on a fictional island off the shore of Okinawa in the Ryukyus called Izayoi Island in Japan. She is known as Yuna's rival. She is self-centered, impatient and in some cases, a bit snobby. Piko/Penny often takes great pride to mock and deride Yuna and Stitch in any case, often ending with Yuna and her fighting. This makes her remarkably similar to Mertle Edmonds. There's rare occasions where she and Yuna can get along though. Her father runs the island's pineapple plants and her family runs the highest rated hotels and resorts on Izayoi, making her snobbery justifiable.
There's a habit with Piko/Penny where when she's angered, she'll often end her ranting with a comparison of something akin to pineapples. She is also a black-team karate leader. Piko/Penny may have been idealized after Hawaiian pop song Pineapple Princess. Piko/Penny dislikes Sae/Sasha but secretly does believe that she dresses better than her. Her minions consist of her older brother, Kouji/Kenny and his friends.