Kaito Goshikida is the main protagonist of the series 'Kikai Sentai Zenkaiger'. As Zenkaizer, he leads the Zenkaigers, a group of heroes fighting against the evil Tojitendo Dynasty. Kaito is known for his cheerful and optimistic personality, and he possesses a strong sense of justice. He transforms into Zenkaizer using the Geartlinger and Sentai Gears, which allow him to channel the powers of past Super Sentai heroes. His unwavering determination and positive attitude inspire his teammates to work together to protect the world from the invaders.