Yuki Yamada is the civilian identity of Gokai Yellow in Kaizoku Sentai Gokaiger. She is a cheerful, energetic member of the Gokaiger pirate team who fights alongside her crewmates using the powers of previous Super Sentai heroes. As Gokai Yellow, she serves as one of the main combatants and contributes speed, agility, and support in battle. Her role in the series is to help the team search for the greatest treasure in the universe while protecting Earth from the Zangyack Empire.