Joker's ninja apprentice. He is a happy-go-lucky boy but also quite clumsy. He was born and raised in a ninja village. He strongly adores Joker and makes sure to protect him. He refers to himself using the personal pronoun "oira"  (「オイラ」) and tends to end his sentences with "-su" (「っス」). He is very good at housework and cooking and dislikes Joker's laziness when it comes to cleaning. Hachi is very patient and easily forgives. He will not however, be afraid to voice his opinions.

There are no items that can not be stolen by Joker, The Mysterious Thief. With his magic tricks, Joker goes around the world, steal the treasure! No half-hearted, ranging from special agents to the most sophisticated equipment was deployed to subdue him. Is there anything that can stop the exploits of The Mysterious Thief?!
 
Note: The chapter count includes 32 extra chapters.

In the story, there is nothing in the world that the mysterious phantom thief Joker cannot steal. He goes after one treasure after another in unpredictable capers with seemingly miraculous tricks.
 
(Source: Anime News Network)

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Yumiko Kobayashi is a Japanese voice actress. Previously affiliated with Arts Vision until August 2007, she now works as a freelance. She announced her marriage on April 7, 2006 and has 2 children.

Part of the seiyuu unit __Prits__ for the anime [Sister Princess](https://anilist.co/anime/836/Sister-Princess/) with other members [Natsuko Kuwatani](https://anilist.co/staff/95136), [Hisayo Mochizuki](https://anilist.co/staff/95393), and [Nana Mizuki](https://anilist.co/staff/95081/Nana-Mizuki). The group has been inactive since 2002, although various reunions have occurred.

Took over the voice role of [Shinnosuke Nohara](https://anilist.co/character/2951) on long-running series [Crayon Shin-chan](https://anilist.co/anime/966) from [Akiko Yajima](https://anilist.co/staff/95148) starting July 6, 2018.

Hachi Fuuma