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Azabu-Juuban, Minato-ku, Tokyo
Sailor Mercury, Super Sailor Mercury, Princess Mercury, Eternal Sailor Mercury
Solar System Sailor Senshi
September 10th (Virgo) 
14 (Dark Kingdom and Black Moon arcs)
157 cm or 5'2"
Reading, chess, swimming, studying, computers, sandwiches, anmitsu, mathematics, the colors aquamarine and blue, water lilies, the gem sapphire, pop culture, romance novels
Love letters, Japanese amberjack (yellowtail)
Ami Mizuno is the present-day incarnation and civilian identity of Sailor Mercury. This is the original depiction of the manga character created by Naoko Takeuchi.
Before becoming friends with Usagi and the other Sailor Senshi, Ami was a shy girl who did not make friends easily, and preferred to spend time alone studying and reading books instead of being with her classmates. In return, many of her classmates believed her to be snobby and arrogant because of her intelligence, as well as a superhuman, as she always finished at the top of national exams, and speculated that her IQ was 300; however, once Ami and Usagi became friends, their views on her began to change.
Ami is depicted to be a sweet, kind, gentle, and loyal girl who is slightly insecure. In the beginning, she relies on the opinions of her mother, teachers, classmates, and teachers, but as the series progresses, she becomes stronger and more confident. She is the most sensible out of the Inner Senshi, and she dislikes fights; especially the fights between Usagi and Rei. Ami's parents are divorced, and she lives with her mother in a condominium.
Ami dreams of becoming a doctor like her mother, and her favorite subjects are math and science. She also has a secret love of romance novels and pop culture, but is embarrassed to say it.
Ami Mizuno is a teenage girl who has short dark blue hair, that reaches to about her shoulders, and blue eyes. She stands at about 157 cm or 5 feet 2 inches. Also, at times, Ami will be seen wearing reading glasses.
Codename: Sailor V
Although Ami is not formally introduced in the Sailor V manga, in Chapter 15, right before Minako is about to leave for China, Ami is shown walking past Minako towards her mother, wishing her luck at a conference before she is about to get on the plane. Her mother thanks her, and promises that she will call her.
Dark Kingdom arc
Ami is introduced in Act 2, appearing on Luna's computer, listing her name, birthday, zodiac, blood type, and age. The next day, everyone is talking about how Ami Mizuno once again finished at the top of the national exams, speculating that she isn't human and that her I.Q. is 300. Umino mentions that the reason she is so smart is probably due her attending a private cram school, the Crystal Seminar. Umino also mentions that her mother is a doctor. Naru mentions that it must to be smart and rich, but Yumiko remarks that's she cold, has no friends, and that all she ever does is study.
On her way home, while fretting about her low test scores, Usagi notices Ami walking home, when Luna jumps on top of Ami's head. Ami pets Luna, and Usagi sees that she is not a bad person. Usagi calls Luna over, and asks if she's all right. Ami says that when Luna suddenly fell from the sky, she thought it was an angel, but becomes embarrassed after saying so. Usagi then introduces herself and takes Ami to Game Center Crown. While there, Ami plays the Sailor V Game and gets the highest score on the game. After she puts her name on the ranking list, a pen falls out of the machine. After that, Ami checks the clock and realizes that she has to go to night school at the Crystal Seminar.
At school the next day, Ami is studying on a computer when Usagi comes asks Ami if she would like to stop for ice cream on the way home with them. Ami sees two students grumbling that they have to get to the Crystal Seminar. She remembers that her teacher has high expectations for her, declines Usagi's offer, and hurries off to the cram school, only to leave her disk for school behind.
After learning the true message in the disk, Usagi spots Ami and the other students from the Crystal Seminar, only to realize that they have been brainwashed. Usagi transforms into a doctor and rushes to save her at the cram school. When the teacher reveals herself to be a youma, she transforms into Sailor Moon, but the youma grabs hold of Ami and scolds her for not using the disk to study. Ami in return tells the teacher that you study by your own initiative. The youma decides to kill her, but her pen glows and the symbol of Mercury appears on her head, and everyone in enveloped in a freezing mist. After the youma is defeated, the fog clears up with Ami in Senshi fuku. Luna tells her that she is Sailor Mercury, a fellow Senshi that they have been looking for.
Black Moon arc
Ami was not included in the original proposal for a hypothetical Codename: Sailor V anime, which instead featured Minako's very similar-looking best friend from that series, Hikaru Sorano. She was present, however, by the time the concept was expanded to center on Sailor Moon.
Naoko Takeuchi designed Ami as the "team brain," giving her genius-level intelligence to create the impression that she was not quite human—in fact, the character was originally intended to be a cyborg with an accelerator. One possible storyline involved her losing an arm or being injured in some other way and dying from it, but Takeuchi's editor objected, so Ami became a fully human character.
Takeuchi describes Ami as looking like Noriko Sakai, a J-pop idol of the early 1990s, and in Ami's original debut, Usagi thinks to herself that Ami resembles Miss Rain, a character from another Takeuchi series. This reference was removed in the 2003 renewal manga. In the English manga, a similar comment was made, but referencing Demi Moore.
Certain background details of Ami's character were chosen symbolically—for instance, her Western astrological sign is given as Virgo, which in astrology corresponds to the planet Mercury. In reference to a popular Japanese belief, her blood type is given as A, supposedly indicating sensibleness and fastidiousness.
Ami: The kanji for A (亜) translates to "Asia" or "second", and the kanji for mi (美) translates to "beauty". So her first name could be either "Asian Beauty" or "Second Beauty".
Mizuno: The kanji for Mizu (水) translates to "water" while the kanji for no (野) translates to "field" or "civilian". The syllable no (の) also indicates possession, so while the literal translation of her family name could be "water field" or "water civilian", others may translate it as "of the water." Also, Mizuno is a common surname in Japan.
- In the side story Ami's First Love it was revealed that Ami was allergic to love letters. Receiving them would cause her to break out in a rash.
- While the idea to make Ami a cyborg was ultimately rejected, later in the series the character Hotaru was a cyborg until her rebirth.
- Unlike Usagi or Minako, Ami's favorite subject is mathematics.
- Ami looks alot like Rena Kuramitsu from Naoko's one-shot story Miss Rain. When Usagi saw Ami for the first time in the manga, she said that she looked like Rena. This reference was removed in the 2003 re-release of the manga.