Vita Magical Girl Lyrical Nanoha Papercraft Model by Moekami

Vita (ヴィータ Vita) is a knight introduced in Magical Girl Lyrical Nanoha A's. She is one of the Wolkenritter, a creation of the Book of Darkness.

Her name is presumably a reference to the Opel Vita. Like all Wolkenritter, she does not have a family name.

As a Wolkenritter, Vita is titled the "Knight of the Iron Hammer" (鉄槌の騎士 Tettsui no Kishi), referring to her weapon Graf Eisen. Additionally, she is called by the Will of the Book of Darkness as the "Crimson Iron Rider" (紅の鉄騎 Kurenai no Tekki).

Her callsigns in the extra forces include StarS 02 (スターズ02 Sutāzu Tsū) (in Riot Force 6, 0075-0076) and Aggressor 2 (アグレッサー２ Aguressā Tsū) (in Special Duty Section 6, 0081).

Physically, she is a small red-headed girl with diminished height. She wears her hair in two queues that trail behind her head.

Vita's appearance and abilities (as well as the name of her Device) recall the Alt Eisen of Super Robot Wars, with her Schwalbefliegen being similar to its Heavy Claymore attack and Raketenhammer resembling its Revolver Stake. Graf Eisen's forms also contain references to GaoGaiGar and Tengen Toppa Gurren Lagann. She also bears some resemblance to Thor, the Norse god of thunder. Like Thor, Vita is a brash redheaded fighter who wields a hammer that changes size appropriate to the situation.

Vita enters A's on a hunt with Zafira for strong Linker Cores to absorb into the Book of Darkness. She targets Nanoha Takamachi, which she deems to be a juicy target, unlike the usual TSAB "redshirts" which can barely fill up a single page of the Book of Darkness. Later, she's shown some strong dislikes toward her until near the end of the series (possibly due to acknowledging her as a potential threat to the Wolkenritter's efforts in filling up the Book of Darkness), which may have driven her to intentionally call Nanoha "Nantoka" (Japanese: "Something-or-Other"). Even after the series ended, she still sometimes drove her anger toward her, like when Signum taunted her that she was "scared to be lost in front of her master" when she refused Signum's advance to put up a group-mock battle training.

Nanoha puts up a decent fight, but Vita tilts the deck with two cartridges and manages to overpower her, obtaining a power superiority so vast that she heavily damages the Raising Heart. However, before she could get the Linker Core, Fate Testarossa and Yuuno Scrya come to the rescue. Vita fights them off with her fellow Wolkenritter, Signum, and Shamal, and they declare themselves enemies. The battle ends with Shamal finally managing to get Nanoha's Linker Core and Nanoha breaking Vita's barrier.

Vita fights for the sake of protecting their mistress, Hayate, to whom she is completely dedicated to. The Wolkenritter attack mages to steal their Linker Cores, their sources of magic, to fill the 666 pages of the Book of Darkness with this power before it saps any more of Hayate's and she becomes fully paralyzed. They continue to obtain Linker Cores and fight off interference from the Administrative Bureau, mainly Fate and Nanoha, while they try to keep Hayate from knowing that they are stealing magic for pages; she has told them that as long as she is the mistress of the Book, she will not allow anyone to be harmed over it.

The Wolkenritter, especially Vita, is determined to save Hayate even if it means going against her wishes. What the Wolkenritter doesn't know about Hayate is that the Book of Darkness, once completed, may stop sapping her Linker Core for pages, but that does not mean that it will stop hurting her or undo its damage. The master of the Book dies upon its completion. Vita is the first to recognize that something may be wrong with what they are doing and that they have forgotten something very important, but her devotion to Hayate keeps her fighting for Linker Cores regardless. Just before the Book of Darkness is completed, Suzuka Tsukimura brings Nanoha, Fate, and Arisa Bunnings to visit Hayate in the hospital while the Wolkenritter is there. The warring groups recognize each other and their shared wish at once and meet on the roof of the hospital. Nanoha and Fate try to tell the Wolkenritter about what will happen to Hayate, but their confrontation is cut short by both the interference of two masked men and the completion of the Book of Darkness with the Linker Cores of the Wolkenritter themselves.

The masked men are women, Aria and Lotte Liese, who frame Nanoha and Fate for the death of Vita and the others. Hayate screams in terror for all of this to stop and is taken over by the will of the Book of Darkness, becoming the fearsome, possessed woman inside of it just as the real duo escapes their prison. Meanwhile, Vita's spirit is trapped inside the Book of Darkness with the others. When Hayate rejects her wish of vengeance, she reprograms the entire Book, but a virus remains inside, the one that caused the evil aspect of the Book in the first place. Hayate awakens the spirit of Vita and her friends inside the book of Darkness, and she decides to join the fight against the automated defense program that Hayate describes as "the 'darkness' in the Book of Darkness". Vita finally recognizes Nanoha as an equal, though she won't admit it, and calls her by her real name. (Fandom Wikia)