Rika is a young girl with black eyes and brown hair with pigtails. She wore a striped turquoise and purple shirt with a white hood.
After two years, her hair looks longer than before, and she has grown taller. She wears a dark colored apron with the Marine symbol and a striped dress with a hood. She wears black shoes and a bandanna tied over her head.
Rika first appeared when she tried to thank Zoro by offering him onigiri while he was imprisoned, but he refused and told her to go away. Helmeppo then came in and took them away from her rudely, saying that if she gave them to Zoro it would be as if she were the accomplice of a criminal, but he then spit them out complaining that the onigiri had sugar in them instead of salt. Rika replied saying she thought it would make them taste better. Helmeppo then ordered a marine standing behind him to throw her out and he reluctantly does so, but luckily, Rika was caught by Luffy before anything bad could happen.
The reason Zoro was imprisoned by the Marines was because he defended Rika when she was nearly attacked by Helmeppo's pet wolf. Because Helmeppo saw this as a crime towards himself, he ordered Zoro to stay imprisoned for thirty days. Zoro, not wanting to cause any more trouble, accepted.
After the timeskip, she appears to be more mature, and is training at the Marine base in Shells Town to become a waitress. She seems to be much better at cooking, and is popular among the Marines. She also has a bounty poster of Monkey D. Luffy hanging on her workplace.
In Episode 2, Rika is seen bringing food to Zoro which the food in the original anime was Riceballs. However in the 4kids' edits, the riceballs were changed to three cookies. Also, when Helmeppo took one and ate it, the third cookie was still in place when she offered them to Zoro.