Shinobu, like her sister Mikoto, was raised to be a ninja by their mother, but she moved on to the path of the samurai. She's a clumsy girl who tends to get lost easily.
Shinobu was born on the isolated Airan Island along with her two sisters, Kunai and Mikoto. They were trained from a young age by their mother Kokoro to be ninja. When all the girls of the island were young, their fathers all tragically died during a storm at sea while fishing. Each of her sisters left their ninja training to follow their own paths, and Shinobu was no different. After being lent a book by her cousin, Chikage; she was inspired to become a samurai. She left on her own journey across the island and met a small cow she adopted as a pet and named Beef Steak.
While training, she wondered to the Southern Forest and learned from Shimatora that a human boy who had recently washed up on the island defeated the Northern Leader, Taiga. This was confirmed by Taiga and Pandaro. When she learned that he had used a wooden sword to beat him, Shinobu wanted to meet Ikuto to be trained in sword fighting. She ended up getting lost for three months.
Shinobu is a main character in the Nagasarete Airantou series that was created by Takeshi Fujishiro. The series first began serialization in Square Enix's Monthly Shōnen Gangan magazine in January 2002.
Her first appearance was in Nagasarete Airantou Volume 8 CH. 43 "Nin-Nin Shite", and her first anime appearance was in Nagasarete Airantou - Episode 18 "Let's Have A Match, Ninja". Her character in the Japanese series is voiced by Orie Kimoto.
Shinobu is one of the older girls on the island, but she is the second daughter of Kokoro. She is a young girl with long hair that she wears in a pony tail, and she wears more samurai inspired clothes. Though, like her two sisters, she was trained to be a ninja from a young age. She left that path, against her mother's wishes, to be a samurai. This is why she ends all her statements with "-de gozaru". She left on her own journey on island to train, but she is naturally clumsy and tends to get lost easily.
Shinobu has a personality that is highly susceptible to outside influences. After reading a book about something that interests her, she then tries to emulate the characters she admires. This is what led to her on the path to become a samurai. Once she sets her mind on something, she never lets go. This is how she finally got Ikuto to agree to train her in kendo. She becomes jealous of the way Ikuto praises Suzu, and tries to win his praise but often over compensates.
Though Shinobu had gotten lost on her way home on request from her mother. She eventually returned to find a young boy in her home suffering from the effects of poison. No one else was around, so, she mixed the antidote and fed it to him with her own mouth. She left to retrieve the food she had left outside, but both he and Suzu had left when she got back. She learned from her mother and sisters that the boy who had left was Ikuto.
She went to see Ikuto, who was living with Suzu, to ask for training, but she wasn't sure where to find him. She ran into Machi in the village, but accidentally gave her the impression she was seeking Ikuto out for marriage. Machi refused to help her find her way to Suzu's home, so, Shinobu chased after her until they agreed to match for her assistance. Machi won the fight despite Shinobu's ninjutsu. She gave up asking Machi, but was led to Ikuto's place by asking Ayane. Ikuto refused to battle her, but she stayed persistent and refused to leave him alone. She even stayed the night and whispered in his ear as he slept to accept her challenge. He only accepted when Suzu lost her patience with Shinobu constant chasing him around.
Though Shinobu is extremely clumsy, she has no problem recovering due to her extreme level of durability. Her strength of body allows her to recover quickly after falling.
Shinobu has trained in sword techniques since she first became infatuated with samurai. Despite her impressive skill from self training, she went to Ikuto for training.
Shinobu was trained in various skills of ninjutsu by her mother. Part of this training also included hand-to-hand combat.
As part of Shinobu's ninja training, she learned how to move at incredible speed for short bursts. This is helpful in combat for getting behind her opponent to strike before they can notice her. However, this speed can work against her due to her natural clumsiness.
While growing up, Shinobu and her sisters were slowly trained by their mother in resistance to a wide variety of poisons. Kokoro gave them all small doses of poisons slowly as they grew up. This made them immune to various drugs.
A special technique that Shinobu likes to use is her ability to create physical clones of herself. When up against a formidable opponent, she will create eight clones to overpower her target with numbers. Sadly, they are still just an clumsy as the original.
Shinobu's introduction in the Nagasarete Airantou anime was changed for the original manga version. As well as her first meeting with Ikuto.