Main • '''''' : (voice:
Junko Hori; drama actor: Kōtoku Nomura, drama voice: Kazuo Imakura, live-action film actor:
Shingo Katori) :
Hattori-kun is the protagonist of the series, a little ninja who is named after his ancestor
Hattori Hanzō. He is 11 years old and, despite his age, a skilled ninja who left his home in
Iga to train in
Tokyo, where he took up residence in the Mitsuba household. The show follows his many adventures and daily life living in modern Japan and his friendship with Kenichi Mitsuba. Both boys find a rival in Kemaki (Kemumaki in some dubs), another young ninja in Kenichi's class. Hattori-kun's main weakness is that he is terrified of frogs (
Ranidaphobia) . He has strong beliefs on what makes a good ninja and reminds everyone of the same. • '''''' : (voice:
Masako Sugaya (1980s series), Tomomi Tenjinbayashi (2012 series); drama actor: Katsumi Takamiya, live-action film actor:
Yuri Chinen) :A 10-year-old elementary schooler who is very irresponsible, lazy and doesn't have much academic or athletic talent but enjoys photography. He has a huge crush on his classmate Yumeko, in the process of which he often gets into trouble with his rival Kemaki and convinces the hesitant Hattori to help him. He is not above tricking Hattori into lending a hand. • '''''' : (voice:
Yūko Mita (1980s series), Yukiko Hinata (2012 series); drama actor: Shigeki Nakajō) :Shinzo is Kanzo's five-year-old younger brother who followed him to Tokyo. Being only an apprentice ninja he uses wooden weapons. His older brother Hattori is his role model. He can cry extremely loudly, stunning people and even causing them to faint. He helps Kanzo fight Kemumaki, sometimes using his loud crying to immobilise opponents. • '''''' : (voice:
Runa Akiyama (1980s series), Haruka Sato (2012 series), Yuka Iwahashi (2012 series)) :
Yumeko-chan, is a classmate and friend of Kenichi's. Both Kenichi and Kemaki have unrequited crushes on her, causing a rivalry between the two boys. Yumeko sees Hattori and Shinzo as brothers. She is a pianist and hates
bell peppers. • '''''' : (voice:
Kenichi Ogata) :Shishimaru is a ninja dog living with Kenichi, who came along with Kanzo and Shinzo Hattori. He is often lazy and stubborn. Along with Shinzo, the two of them wind up doing mischief and creating trouble. He has an attack technique of turning in a fireball when provoked. He also has the ability to change form into any other animal. He loves to eat all kinds of delicious food especially chocolate roll. • '''''' : (voice:
Kaneta Kimotsuki (1980s series), Kazuki Ogawa (2012 series), live-action film actor:
Gorie) :Kemuzou Kemumaki is the antagonist of
Ninja Hattori-kun. The 11-year-old ninja comes from the
Koga village and hence is a sworn rival of the Iga native Hattoris. He lives alone in a small apartment with his ninja cat Kagechiyo. As per the Koga rules, his ninja identity is a secret, with only Kenichi and the Hattoris knowing about his dual life while he attends elementary school as a normal student. He is much better in studies and sports than Kenichi, however he isn't as good a ninja as Hattori-kun but never gives up trying to beat him. Despite being the main antagonist, he is actually a nice but lonely boy who sometimes helps out his rivals. He is also quite innovative, often making many new tools unlike Hattori who uses his traditional tools. Kemaki strongly adheres to his clan rules of never using ninjutsu for criminal acts, going so far as to temporarily excommunicate Kagechiyo for stealing an ice cream. • '''''' : (voice:
Eiko Yamada (1980s series), Ai Fukada (2012 series)) :Kagechiyo is a talking ninja-cat of the
Kōga-ryū clan. He serves as the supporting antagonist in the series. Usually, Kemumaki assigns significant tasks in his plans for Kagechiyo to carry out, but he often fails to succeed. This is because he doesn't receive enough training from Kemumaki and is often seen sleeping on the streets. Hattori notices him several times. He has a rivalry with Shishimaru. He typically hides in the Mitsuba house to eavesdrop on Kenichi and his friends' plans, and afterwards, he informs Kemumaki about them, making him well-suited to being a spy. At times, he resents Kemumaki for his strictness and imagines living a life of luxury as a normal cat in some episodes. He obtains an attack of static electricity by rubbing a shiny metal plate against his back. If he uses this attack too much, it will drain his energy, and he will feel weak.
Supporting • '''''' : (voice: Yōko Kawanami (1980s series), Ai Fukada (2012 series)) :One of Kenichi's teachers. Koike-sensei has a crush on her. The subject she teaches is unknown. Though in many episodes she is shown teaching the class music. • '''''' : (voice:
Issei Futamata (1980s series), Hayato Nakata (2012 series), Tomokazu Yajima (2012 series)) :Kenichi's teacher, also appears as a ramen chef in
Obake no Q-tarō. He is caricatured after animator Shin'ichi Suzuki. • '''''' : (voice:
Yuzuru Fujimoto (1980s series),
Eiji Yanagisawa (2012 series); drama actor: Teizō Muta) :Kenichi's father. He usually smokes and comes from his office late in the evening. He likes eating and golf a lot. Though a rather plump man, in some of the episodes, his size seems to change, going from stouter to slimmer. He gave Kenichi his name, hoping for his son's good health. • '''''' : (voice: Yukiko Nashiwa (1980s series), Miwa Kitahara (2012 series); drama actor: Chiharu Kuri) :The mother of Kenichi. She is a slim housewife who is busy keeping order of a house inhabited by six, including Shinzo who often wets his
futon. She likes Tsubame and thinks that Kemaki is a good boy (not knowing of his ninja identity and pranking habit). Kenichi constantly stresses her out with his bad grades and his preference for playing over studying, making her lecture him. •
: (voice:
Fuyumi Shiraishi (1980s series)) :A.k.a.
Tsubame-ko, is a
kunoichi and classmate of Hattori-kun. She likes Hattori and always wishes to marry him. She has a dislike for Kemumaki and Kagechiyo. She wears pink coloured ninja robes. She seems to own a
recorder, a
clarinet, a
flute, a
piccolo and a
bassoon, five woodwind instruments.
Other • '''''' : (voice:
Reizō Nomoto (1980s series)) :A professor who lives in the United States (USA) and invented Togejirou. • '''''' : (voice:
Hiroko Maruyama (1980s series)) :A cactus having supernatural powers is sent by Professor Shinobino from the United States. Shisimaru does not like Cacto-chan and loves to compete with him. •
Isa Yohi :A koga ninja girl who is a senior of Kemumaki and a frenemy of Hattori. First she start to fight Ninja Hattori. Later She also helps Hattori and His Friends. This character was appeared in 2012 Anime only. •
Robert :An american ninja who is a student of Ninja Hattori. He learns only wrong Ninja techniques. Later these become very useful to him. •
Saizo :An iga ninja boy who tries to achieve primary school certification. His power is creating a cloud and using for a transportation. •
Gosuke :An iga ninja boy who tries to achieve Primary School Certification. His power is do anything within few seconds. •
Surasuke :An iga ninja boy who tries to achieve Primary School Certification. His power is speed. •
Old Grandma :Saizo Gosuke and Surasuke's adopted grandmother. She like them and take care him as grandsons. She also helps Hattori and Kenechi. •
Kittu :Kiyo's Little Brother Cat. Kittu likes Kiyo and thought as a Big Brother. Kittu uses Ninja techniques also. Kittu mostly appears in the 2012 anime. •
Momombe :An iga ninja squirrel who is a childhood friend of Shishimaru's. Momombe uses more ninja techniques than Shishimaru. Momombe mostly appears in the 2012 anime. •
Inspector :A sub-inspector of Mitoriquaika City. He likes Hattori because Hattori and his friends help him to catch the thieves. He mostly appears in 1981 anime. • '''''' : (voice: Tadao Futami (1980s series)) :Hattori-kun and Shinzou's father. He also appear in
Perman, when he fights with Perman. • '''''' : (voice:
Junpei Takiguchi (1980s series), drama voice: Hiroko Maruyama) :A giant turtle monster ninja. He and Hattori are ninja partners. •
Tai-chan :A baby who uses ninja techniques perfectly. He learned ninja techniques who taught by Hattori Kanzou. Tai-chan is mostly appeared in 2012 anime. •
Toko :Yumeko's pet. Toko always likes Kenichi. So, it became a friend to Kenichi. Toko is appeared in 2012 anime. •
Mimicky :Kiyo's enemy and Kemumaki's old pet. He copies everyone for his hungry. He ate free food who given by his owner who copied by Mimicky. •
Ninja Eagle :An iga valley's messenger. It gives a message who was given by an iga valley's members to Hattori. •
Pet Teacher :Kenichi's pet teacher was appeared in few Episodes of 2012 Anime. •
Mokamaru :He is a high tech ninja. Hattori's old enemy. He uses computer ninja techniques to attack Hattori. He appears in the movie
Ninja Hattori-kun: Nin Nin Furusato Daisakusen no Maki (Ninja Hattori - Home Town). •
Green Frog :Kemumaki's pet. Kemumaki use this pet to beat Hattori's brave. Green frog is appeared in 2012 anime. ==Media==