Rika is a player in Grand Line 3.5, which tells the story of One Piece. She plays multiple characters within that universe.
Rika is Cory's cousin who used to game with Luke and Cory in High School. She was very excited about being able to join their gaming group after enrolling into their University. One of her most noticeable characteristics is her tendency to speak so quickly that it's hard to make out individual words and with the appearance of not having to stop for breath.