Jukai is a member of the Anten Seven and the Kei Pirate Guild. The "eldest" of the seven assassins, Jukai protects Hazanko and rarely leaves his side. Presumably the closest to Hazanko, Jukai displays absolute loyalty to his master. As well as being loyal, Jukai acts as a bodyguard to Hazanko, defending him against lower-tier enemies by merely moving him out of their reach. Despite (or possibly because of) his presumed experience and age, Jukai is arrogant and underestimates those he believes aren't strong enough to defeat him.