Hachi  

, ハチ

The apprentice in question is a joker who grew up in a ninja village. Despite being clumsy and carefree, he deeply loves Joker and takes great care to safeguard him. Oira, his nickname, ends each sentence with "ssu," which is short for "desu." Although he may not be skilled at martial arts or espionage like other ninjas, he excels in household chores and culinary arts.