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, even being superhuman, as she always finished at the top of national exams. However, once Ami and Usagi became friends, the opinions 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, 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.