Ami Mizuno is a teenage Japanese schoolgirl who transforms into Sailor Mercury, a member of the Sailor Guardians. She is known for her extraordinary intelligence, often rumored to have an IQ of 300, and excels in mathematics and science. Initially shy and reserved, her dedication to her studies is frequently misinterpreted by classmates as aloofness, which makes it difficult for her to form friendships. She lives with her mother, a busy doctor whom she admires and hopes to emulate, after her parents divorced; her father, a painter, maintains limited contact. Her friendship with Usagi Tsukino, Sailor Moon, is transformative, as Usagi is the first to see past her shy exterior and help her come out of her shell. As Sailor Mercury, the Guardian of Water and Wisdom, she serves as the team’s strategist and analyst. Her abilities are based on water, ice, and mist, including attacks such as Shabon Spray to create blinding fog and Shine Aqua Illusion to unleash a freezing wave of water. She also wields a miniaturized supercomputer and a visor to scan enemies and analyze their weaknesses. Kind, gentle, and deeply loyal, she dislikes unnecessary quarrels and is often the voice of reason among her friends. In her free time, she enjoys swimming and playing chess, and she secretly appreciates romance novels and pop culture. Her favorite foods are sandwiches and anmitsu. Over time, she grows from an insecure, isolated girl into a confident and courageous hero who values friendship and protecting others above all else.