Hakkai is a character from the Japanese manga and anime series Saiyuki, which is inspired by the classic Chinese novel Journey to the West. He is known for his calm demeanor and strong sense of justice. Hakkai possesses the ability to transform into a powerful creature, which enhances his combat skills and makes him a valuable member of the group. In the series, Hakkai travels with Genjo Sanzo, Son Goku, and Sha Gojyo on a quest to retrieve sacred scriptures. His character often serves as a mediator during conflicts, showcasing his wisdom and compassion. Hakkai's backstory includes a tragic past, which adds depth to his personality.