One of the main characters in Magical Lyrical Girl Nanoha A's, she is cyborg and a trainee under Nanoha. She also appears in the next sequence of the anime, Magical Lyrical Girl Nonoha StrikerS.
Subaru's story begins roughly four years before the series actually starts, she was at Mid-Childan Airport. While she was there, she suddenly got caught in a fire, along with her sister Ginga Nakajima. In the mix of the fire, Subaru was hysterical, and crying and screaming for help, when a large statue was about to fall on her. Nanoha came to her aid, and saved her from certain death. To escape the other dangers surrounding them, Nanoha created a hole in the roof using the Divine Buster, making for a quick escape. From the experience, Subaru has always held Nanoha close and respected her greatly. This evident in her training, willingness to protect her, and courage and bravery so much like Nanoha's.
At the actual start of the series, Subaru was tested to raise her Mage rank from C to B, Teana Lanster also participated in this event. What neither girls new, was that Nanoha were watching the test herself. Along with Nanoha, Fate Harlaown and Hayate Yagami were also observing the test. They were being observed to see if they were capable of being members to Riot Force 6, a new TSAB Ground Force Division. Even though both girls failed, they did go on to become members of the squad, and were given the oppurtunity to retake the test nearly immediately after they failed it the first time.
When she learned that she would be in the same squad as Nanoha, Subaru was very excited to be able to work with her new mentor and idol. However, Subaru's fighting style was much different from her mentor, so she was then sent to train with close combat Vita. In Episode 18, it was shown to Subaru that she and her "sister" Ginga were not actually humans at all to what they thought were there parents, but actually cyborgs.
This specific series in the anime, focuses more on growth and prosperity for Subaru. Here, we see Subaru's origin, and how she discovers Nanoha and her great respect for her mentor. She also joinds Riot Force 6, a new squad made from the TSAB Ground Force. She begins training with Vita, and learns to use her magic in a new way. She uses her magic combined with her new close combat training, making her a highly lethal "weapon" or foe. Along with training in magic with Vita, she also shows Subaru various close combat techniques using various weapons from her cyborg technology to using her hands.
Subaru also appears in this section of the anime series. She is a member of Special Duty Section 6, and while a member she is deported to Wolfram to aid Fate, Erio went along with her. While fighting, she gets in a fight Veyron. She evetually takes her over, using her high-level skills of combat. Meanwhile, Thoma uses the Zero Effect which disables nearly all machinery and living beings with in a short radius of the device. Due to the action, Subaru lost nearly all her senses, making her mostly usless in battle. The worst part of the fight was that Subaru's body system temporarily lost movement and function, and she barely survived.
Subaru appears in two of the four series of Magical Girl Lyrical Nanoha.
Magical Girl Lyrical Nanoha StrikerS - Also appeares in this series 26 Episodes, more focused in this series.
Subaru's magic is unique compared to the other Magical Girl Lyrical Nanoha characters. Instead of using it as a primary weapon, she blends it in with her close combat fighting and skills, which is why she had to train with Vita in StrikerS. She is usually very skilled with her magic, and uses it quickly and efficiently. Her unique style of using magic is known as Shooting Arts. Even though she has little knowledge on the "normal" arts of magic, her special type has always been enough.
Subaru is enchanced greatly when she goes into her Cyborg Combat Mode. Her physical stats increase, along with a variety of new tools and weapons too use in battle. Her eyes change to Amber when she goes into this form, and her magic circle changes to combat cyborg circle. However, Subaru must always be on guard when in this form, for the Cyborg is very weak to direct attack. In fact, Subaru or any other Cyborg could be killed instanly if they take there defensed too hastily in the Cyborg Combat Mode. Along with her higher physical stats, Subaru also thinks clearer or the same while in this mode, a bonus to match the physical changes.